I'm with Eric on this too, very naive & pretty insecure of you to expect your DP to find you exclusively attractive, he;s have to be dead not to be open to "looking" but its a whole different ball game if he is "acting on"
Thats said, I personally fried my DHs balls when I caught him using online porn
because it suddenly explained why my computer was clogged up with cr@p & he;s not computer savvy enough & it also meat the way it had infected our computer, DD was at risk of pop ups too as we share a computer......he's not done it since 
His magazine stash on the other hand are well hidden from DD & I really don't care, its only a bit of innocent titillation, I mean, I watch Steve Muscle arms & Merlin, so I can't deny him that 
but at the end of the day, as has already been said, everyone is different, & it down to how YOU feel about it, talk to him, if its a genuine obsession of his, then he does need sorting out, or maybe if its just your insecurity rather than the exploitation angle you worry about, maybe be realistic & reach a compromise,