There are more rules, in more sects of Christianity than you could ever count. There's really nothing noteworthy in the scriptures because it wasn't really an issue back then. Yeah, it was around, it just wasn't something worth fussing over.

Now days, it is. Most sects, for political correctness sake, public image, formalities, and community position, are gonna say it's a no-no. So you're gonna have to define 'the Bible and Christianity' for yourself and decide what it all means to you, then make your own judgement. If you don't want to do that there are always plenty of volunteers to do it for you.