Hrmmmmm does he have a secret issue with penis size or shape...some insecurities? Now I'm not being fascetious cause I have known women who get VERY upset when their partners watch women with the same hair color as they have in porn videos. What you could do is buy a realistic dildo and then discuss with him, very frankly, where the dildo doesn't match up to the silky, warm, sweetness of his penis. Use it with him, use it for him, talk about it without reacting to his comments (this part is key) you must not get upset or angry because he is scared of something changing in your relationship if you have a "replacement" penis. We all know there is no replacement for a real live penis...but it can seem like a slap in the face if you are insecure to begin with.

Good luck with this and remember you don't necessarily NEED a realistic penis there isn't a type of dildo/vibrator material that doesn't have unique but not realistic equivalent. Maybe you will just have to use unique but not threatening vibrators and dildos to keep the peace between you and your partner...or at least until he is less threatened by them.