what to do?!?!?!

ok y'all so here's my problem: I have a complicated relationship with one guy that is potentially toxic but I'm SUPER sexually attracted to him, whereas with this other guy he's perfect in every other way like I can see myself marrying this guy except I can't see him sexually like I can't imagine myself having sex with this guy!

Part of me feels like this is such a big thing because this is the first time I've actually felt sexually attracted to a guy. I'm 17 and I just wanna have fun and whatever but at the same time there's a lot to weigh up!

Is sexual attraction something that grows or is it something that's a instant, gut feeling?? Thoughts???