As a teenager I'm forced to choose sex. But it entirely depends on things such as how hot the girl is, how many times have I had sex with her before and how was that, do I like her personality, can I play games with her, are they good friends, had we made plans or was it sudden, what will we be doing and how long, how long has it been since I got laid, how far is the travel time, am I hungry... I could go on, but you understand.