Do you fantasy thinking about your bf/DH having sex with other women?

When I am having sex with my DH I imagine him having sex with some previous girls, he didn't have any real relation before me, just one night stand. It really turns me on. Is that very weird? Or I imagine that we are having a 3some or that I take him to a strip club. In real life I am very jelous and will never let him even go to a strip club, I will not have a 4 some either. But when having sex it really makes me hot.