How do you tell a guy has an erection even when he's hiding it?

question says it all... but more insight:

when were making out and I can basically feel his crotch which seems really... warm

Updates:
what I mean by feel is that our bodies are just pressed up against each other. I'm not reaching down there.

Most Helpful Guy

  • Warm = blood. Blood = erection.

    But yeah, when I was first dating my girlfriend (second base max) it of course gave me erection while we were making out. I knew that she would freak, though, so my brain kinda didn't allow full-on erections. Perhaps this is where you and this guy are at.