How do you woohoo in sims 2 ps2 version?

You have to get a boyfriend/girlfriend and propose to them, then buy a 2 person bed. Well you ready do not have to propose to them because you cann be in a serious relationship without getting married. But you really do need a two person bed. You could as soon get the "Love Tub" and have a active in the tub with a lover. :)