Making out can be an exciting and sensual experience for both guys and girls. When girls get excited they usually experience swelling of the genital area--the labia (or lips) and clitoris. Her excitement just isn't as easily detected as a guys'.

Guys' penises, on the other hand, are in such a prominent position on the body and are so much larger than the clitoris that it's very easy to tell when a guy is excited.

Are you annoyed because you feel pressure to "do something about it" when a guy has an erection? If so, don't sweat it. You can simply take it as a compliment, an indication that he's attracted to you, and leave it at that, unless you have a genuine desire to go further.

For more information on this topic, check out gURL's fast facts on erections.

Take care.