Well he must have had sex to have you as a daughter and gross as it is to think about, im sure sex was and is as enjoyable as it is for the rest of us.
Wether you're in a sexual relationship, have had one or are hoping to have one at some point, i'm sure when u hit 30 u wont just stop.
I'd suggest taking a deep breath, hugging him and trying to be nice, coz if he has to resort to porn then life can't be that great for him at the moment.
xxx