You could have a pin the banana on a nekkid guy game

or make circle rings, or the ones for a pool and use them to toss them at a fake carved "male genitalia" *no idea what to use to carve it from, maybe sterofoam.

Buy a playgirl, and pin balloons over the guys" parts" and then make the bride to be bite them all off one by one

You could do a dirty pictonary game,

You could draw out your favorite, hmm, ways to, well, you know and see whom has the most detailed....

Take pictures of the hubby to be, and then all of yalls boyfriends/husband, cut certain areas out, not nasty areas! like ears, eyes, nose, feet etc. and see if she gets them right...Although that might be a stupid idea.

I dunno, I hope these kinda helped