trust and respect...... everything else falls nicely into place after that
Respect, it leads to trust.
Chemistry, certainly it has to be Chemistry.
We are talking about sex are we not. It does not mean Relationship, Love, Marriage and a batch of Kids.
Remember is just Sex!
I think it can't happen without love and lust.
Humor, playfulness, a willingness to explore.
And you can't really explore fully without love and trust.