Is it normal that i like to stretch my vagina?

When I first met my boyfriend, who is bisexual, our sex life was great but a couple months into our relationship he told me I was still too tight for him and he'd like me be stretched out. He started hosting gangbangs for me and him and it took our relationship to a whole new level. In our first one I fucked his friends and they came in me so much the squishy sounds echoed in the room. My boyfriend then had me do double vaginal with him & one his friends while another one of his friends fucked him and I orgasmed until I passed out. The sensation of two cocks rubbing against each other in all that cum and the force of his friend pounding his ass omg it was amazing. I've been hooked ever since. I started masturbating with huge dildos vaginally and anally and we've never been more sexually satisfied with each other. I like the full feeling I get with the dildos and he likes the loose sloppy wet feeling of my pussy after I take them. My pussy and ass can gape now after a good fuck or gb but we want to work up to me taking his fist. Is this weird? Oh, and if there's any firsthand advice out there on stretching or fisting I'd love to hear it.