Jan 06, · Seal your party favors with a kiss. Ask each guest to wear their fave lipstick, then lay out a bunch of card-stock postcards. Invite everyone to kiss each so you’re left with a stack full of. The simplest Valentines day party ideas for adults are right under our noses. Making the most of hanging out together at home is easy to overlook, since you see each other there most of the time. This is a great opportunity to relax, especially for busy couples.