The film continuously hints at a threesome between Burt, Kris and Jill.
You mean other than when it is explicitly stating, repeatedly, that Burt and Jill's characters have never had sex?

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The film continuously hints at a threesome between Burt, Kris and Jill. Look at the poster. The three look like a married threesome in a church. In one scene, at the hotel where the three have rented two rooms next to each other with a connecting door between the room. Burt sees the "do not disturb" sign on the door in the hallway. He enters the room adjacent to it and tries to join them from the door connecting both rooms. There's a "do not disturb" sign on that door too. Because he can't join them and feeling left out, he goes to bar a picks up some woman. It's pretty obvious.

Someone tagged it wrong, because it is not. Burt's character makes a joke in the begging to a reporter about gay men on the team, thats it! Other than that it is pure conjecture.
http://www.tcm.com/mediaroom/index.jsp?cid=186977
The Truth is out there.

I can't remember the last time I was on an IMDB movie board and didn't see a post about it being gay.
My Sig: Nothing Here

I don't get where those keywords come from, but they're not from a human, and they're not from someone who's seen this film. There's no bisexuality in this film (not that there's anything wrong with it, of course). Burt, Kris and Jill all live together, but only Kris and Jill are involved not Kris and Burt, alas. There's some fanny-patting in the shower after the game, but I hardly think that counts as bisexuality because all guys do that, don't they?