Hmmmm

Quick question. I'm 24 and I have a boyfriend for 1 year now and sometimes when I see like a vine of a pretty girl twerking or something with a very pretty girl I get aroused but I know I'm not into girls I've already tried and it wasn't my cup of tea and I love my boyfriend with all my heart and wouldn't change him for the world. I just wonder why I get so aroused every time I see a very attractive girl on a video dancing or something lol i think it's weird. Any suggestions?