ok, heres a mans point of veiw
firstly, the signals women give off are rarely picked up by men , he , i would assume, had no idea you were suducing him to bed, he probobly thought you were tierd, and if he was horny and it turned out you wernt in the mood attall and just wanted to sleep, there he it with a raging hard-on next to the woman who's body he desires and he cant sleep, not ideal, belive me.
porn can offer stuff that a girlfreind might not be able to, maybe one certian thing really turns him on, a fetish for something, ruber or fur , maybe he has a submissive compulsion that would embarrasse him to tell you about, if your broad-minded enough you could possibly squeeze it out of him and go and enjoy whatever that is together.
lastly, he doesnt feel emotional attachment to any of the naked ladies he wanks over, it's just a fun 10 minutes wanking over pretty girls , lots of images , different types, men usually cant have a hareem, but historicaly men who have had that oppertunity have chosen to have one .
one more thing, a big difference between the sexes, men are very visual, they love to see women undress, it really gets them, women are much less visual, read a woman an erotic text and your much more likely to turn her on than if you show her a picture of a naked man. do you have erotic literiture in your house? are you being arrogant to assume that the manner you get turned on is acceptable and the way he does isnt?....and relax, it's only porn!