I just can't physiologically (right term? Its fancy and I *think* it might be right) orgasm from a penis (I don't like anything else in there personally) going in and out. Nah. I've had greats ex in part because of the emotional connection I had to my partner, but the chances of me cumming from PIV alone are gonna be the same whether they're a long term partner or one night stand. Idk, you can still take time to explore each other's bodies even if it is a one night stand, although for me it's much more comfortable with a relationship partner, simply because of anxiety.