Threesomes are awesome> My boyfriend and I regularly have another guy over, and I love being fucked in fromt of my boyfriend and I love watching him fuck another guy.

A couple of men have watched their women suck me
I sucked a guys cock in with his girlfriend at a adult bookstore.

it is a huge turn on, have done it a few times with various Girl friends watching.
Had a then GF who kept me shaved [ way before it was the in thing] She talked me into sucking her sisters BFs cock. While I had sucked cock before, never did it while a female watched. What a major turn on. Traded blow jobs a few more times. Funny her sister never knew.
Another even better was more recent with my very DOM.kinky lady friend who CDed me in stockings, garter-belt
cut out bra [ so my pierced nipples stuck out, she pierced them ] Oh I was shaved sissy smooth too.
Invited a couple and there male friend over for drinks. Not long after she ordered me to strip off my man clothes I was on my kness sucking one cock then the other. Then both cocks in my mouth at the same time. Eventually I was on my back legs up and out being fucked while sucking the other.