Agree with last point, it is all about communication.

Sex is as much in the head as hips, its not the cock or pussy but the person ..all fantasy is just fantasy and v.different from reality. if you don't want to do it then don't - anyone who respects you, will respect this decision - otherwise ditch'em.

If you want to, then do it but be sure, try to imagine how it will feel, not physically mentally eg seeing another girl suck your mans cock? Or kissing him? or him taking her ? Will you be ok with that? and face it someone at some point will get left out - be prepared for that.

Good luck

Wildeye