I don't mind at all when a girl sits on my lap. I might not be physically attracted to her, but I still sometimes get an erection when she sits on my lap. The reason for this is because her anus or vagina is rubbing on my genitals, so... obviously that happens. My friends that are girls know that this might happen, even though we are just friends and they know I am not "Attracted" to them. The first time I popped a boner with them, they asked if I liked them as a friend or a girl friend. I gave them the truth and they are fine if I pop a boner while they are sitting on my lap... I could care less if they sit on my lap as long as they know we are just friends. Now, on the other hand, when my girlfriend sits on my lap, she is as hot as anything... so she knows I will get an erection, and she is perfectly fine with that. I made sure with her before anyone of my friends sat on my lap that it was okay if they sat on my lap.