Kind of stupid if you don't tell her from the start. Wouldn't you want your woman to share in your fantasies? Also what if she likes the same shit?

Doesn't mean you want her getting gangbaned or bukkaked. It just means you enjoy watching certain porn.

Me and my girlfriend love watching porn. We've been together 8 years and are have a great time watching it together. She picks her porn and I pick mine. Sometimes we have the same tastes and other times our tastes in porn are different. But that's what make's it interesting.