#1 Good Kissers
"The way they kiss. In my experience, the man who puts his whole tongue down your throat is also the one to jam his c--k into you without any kind of foreplay and jackhammer away."
#2 Taking The Lead
"I find that a good indicator is how willing they are to take the lead. To me it shows that they're confident. If somebody initiates sex or any sort of action then I find that they tend to be a better sexual partner.
"Edit: Just to clarify, consent is very important. Obviously if somebody isn't reciprocating your advances you gotta respect that. I meant that it's always good when your partner doesn't wait for you to do everything yourself. It's a give and take situation."