Once when completely out-of-it drunk. Luckily everything came back clear.
Numerous times in one long-term relationship.
For us it brought an extra level of trust, excitement and intimacy into our relationship and to the sex we had. Not to say that it wasn't there before but we felt it heightened it.
Any other relationship we always used protection, still was great sex.
Though if I'm watching porn I tend to watch more bareback scenes.
With a casual encounter (rare
) I would always use (except that one time mentioned above, a lesson learnt) and recommend protection.