Hi, I have a question about m to f transsexual people. Why some of them have their penis erected when I only lick their nipples? Does that mean they like having sex with me? I mean, if someone else (someone they don't like to have sex with) licks their nipples, they won't have their penis erected. So, can we conclude they like having sex with me? I don't touch their penis, and only lick their nipples, and then find out they are erected, is that because they are also psychologically aroused, finding me attractive and mentally like having sex with me?