Without a doubt, hooking up two male characters in EA's life sim is the best way to get a full-on man snog in a game. It's sizzling with proper face-eating passion... and just check out those exploratory hands all over his rumpus. Hot stuff, indeed.
Of course, if lady-on-lady romance is more your thing, Sims 2 will gladly oblige. It is a life sim, after all, so has to cater for all tastes. Well, within reason...