Is it normal that i do this?

Alright, I am a straight 17 year old male, and am in a great relationship. But in the past I am sent pictures and all that to a lot of girls and have stayed in touch with some. Some that have been in relationships and every time I would ask "Have you had sex lately?" and if they replied with "yes" I would ask "Ohh, was it bigger than mine?" or "Was it big?" and even if it was a yes or no I would ask "Is it circumcised or uncircumcised?" and then I would get told whether it was or wasn't. I have sometimes done this while in the relationship and have told my girlfriend, but I did not send pictures or anything like that, just asked the questions. But, the thing is, I didn't think of a penis or anything when I'd sext them, and all that stuff and jerk off, so is this normal? Do any other straight males do this?