I'm going with Groeteschele being straight. He rejected the woman's advances because he was offended by her getting off on nuclear war.
You've seen Guy Standeven in something because the man was in everything.

He could have had the same reaction that Billy Bob Thorton did in The Man Who Wasn't There when Scarlet Johanson attempted to perform the same act on him in the car. "Heavens to Betsy, Birdie no!"

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Thought it was pretty weird scene at first. When the character became clearer later with the whole nuke 'em now that we have a chance -attitude I figured maybe he really just doesn't care.
Like some said already, I too thought the whole car scene was very out of place for '64.

I guess we will have to wait for a Quentin Tarantino re-make.

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pretty risque for 1964. She clearly wanted to give him fellatio right there in the front seat. And he slaps her? Well I guess what else could he do; it was 1964!

If a man is attracted to a woman physically he is usually not going to worry about the reasons the woman is attracted to him. It would be a problem if they had an ongoing relationship.

In the book, he didn't reject her at least not physically:
When he finally placed her small body in the corner of the car he knew she was satisfied.

i believe Walter MAtthau-Grotech the professor..ahem, was straight as an arrow. He is pompous, accomplished, and arrogant, but he is also an esteemed member of the intelligence/bureuacrat community. Ms Wolfe seemed to be a party crasher, a social climber, who invited herself to the party, or at least ran in similar circles. She was awestruck by the older man was so impressed by his influence and stature that she wanted to initaite an affair. Just think of Paula Broadwell and Gen. Patreus from 2012
At any rate, the "I'm not your kind" declaration by Grotechele was his way of pointing out just how cheap and petty he figured her to be.

Incorrect- if you recall, General Ripper DID resist sharing himself completely with women. He says to Peter Sellers playing Group Captain Mandrake, "I do not avoid women, Mandrake. But I do deny them my essence." So he will socialize with women where necessary but he won't do the nasty with them!

If that's really the explanation from the book, this is one of the few examples of where a movie improves upon its literary origins. I think I can speak for most men when I say that if I met a woman who got off on the idea of incinerating millions of people, my rejection of her would not require a self assessment of my potency.

All this talk about fluids and juices and substance makes him sound remarkably like Gen. Ripper in "Strangelove"- except that our Professor resisted while poor Jack didn't. Hell hath no fury like a madman scorned; at least he got to take out his nastiness on the flouridation Commies.
geoff@greenmarble.ca

That sounds like General Jack D. Ripper from Dr. Strangelove. He was worried about his "precious bodily fluids". He also said "I do not avoid women, but I do deny them my essence."

It was also in the 1962 book "Fail-Safe" by Eugene Burdick" and "Harvey Wheeler" (both lecturers of political science). The character's rejection of Ms Wolfe was due to his the fear of his loss of potency. From the book: "He realised that he had always feared women because in each of them there was the buried but inextinguishable desire to love a man to death. Evelyn Wolfe was simply more obvious and direct about it than the others. She would, without mercy and as if it were her due, draw the energy and juices and fluids and substance from his body through the inexhaustible demands of pure sex."

Although it is not explicitly stated, it's certainly implied that Groeteschele is Jewish in the later confrontation with General Black when an obviously excited Groeteschele exclaims that if every Jew had been armed and resisted the Nazis, there wouldn't have been a Holocaust, and that they had learned from them to which Black replies that Groeteschele has learned all too well, implying that Groetschele has become exactly the same as what he hates.
Yes, this is heavily implied by this exchange, and the novel makes it clear. Groeteschele was actually born in Germany, got out in the 30s (his father, who was a respected surgeon, couldn't get his license to transfer to the US, and had to become a butcher instead). Groeteschele joins the Army, and with his perfect German, becomes an interrogator of captured Nazi War Criminals.
I want the doctor to take your picture so I can look at you from inside as well.

Interesting take on Groeteschele rejecting her advances but I don't remember anything in the film indicating her being a Gentile or Red so I think your premise is a stretch. She just seemed to be a cheating wife whose fetish was thinking about millions of deaths caused by her pushing a button and getting sexually aroused by it.
Also, it's only much later in the film as you pointed out do we realize he may be Jewish.
If the writers wanted to, they could have pursued your angle just to give the film an added twist which I think would have been very interesting but showing Jewish racial/ religious supremacists (and I have run into them) would have been a no - no then as it is now.

Prof. Groeteschele is the first representation of what we now call a neocon. Before he has his confrontation with General Black, he urges a first strike on the Soviet Union: "Every minute we wait works against us. Now, Mr. Secretary, now is the time to send in a first strike and if we actmow, right now, our casaulties will be minimal."
Then General Black turns around and challenges him, "Do you know what you're saying?"

I have another take on Groeteschele's rejection of Ilsa Wolfe's sexual advances. While he ostensively indicates that he despises her for her apparent arousal over his theories on mass nuclear annihilation, Groeteschele may suspect (if not outright know) that Wolfe is not Jewish (as well as a possible Communist, to boot).
Although it is not explicitly stated, it's certainly implied that Groeteschele is Jewish in the later confrontation with General Black when an obviously excited Groeteschele exclaims that if every Jew had been armed and resisted the Nazis, there wouldn't have been a Holocaust, and that they had learned from them to which Black replies that Groeteschele has learned all too well, implying that Groetschele has become exactly the same as what he hates.
IOW, as the Nazi theory of Aryan superiority believed themselves to be the Master Race and could not dilute it by interbreeding with inferior races, Groeteschele, likewise, cannot have sex with an 'inferior', which is, quite obviously, how he regards Ilsa Wolfe.
I think this is the whole point of the scene, to reinforce that Groeteschele, in his quest to perpetuate his chosen political system and eliminate all others, is every bit as bad as his perceived enemies.

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This is one of my favorite movies of all time and have watched it many, many times; I agree with you, she's definitely groping at him!

I personally spoke to the screenwriter of this film, and he categorically denies that Prof. Groeteschele was modeled in any way on Kissinger.

Watch what she is doing.
The more he talks, the more excited she gets.
Look at her face and eyes.
She blots the lipstick from her lips.
Then she touches him for a moment, and lies back on the carseat.
As she lowers her eyes, her hand is moving
She's not reaching for the chewing gum!!!!!!!
She got slapped for where she reached.
He was a married man and didn't want any part of her games or twisted fantasy.
notice how his part of the conversation was quite matter-of factly and flippant?
He knew her type and how to push her buttons. but he didn't want any part of it.

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