Agreed.  Being a part of her being sexed by another man is so exciting.  Her orgasm(s) can be so intense that it is all I cando not to cum just watching (or licking her while she is fucked).  Then its my turn.  I mount her right away sometimes she is still in an orgasmic state.  I know what my job is now.  I go completely animal.  Gentle, but committed.  Done right we both orgasm.  On a good day... repeat as necessary.