I personally prefer female, just how I am. I tend to bond better with them than I do males. For some odd reason, I can talk to a female about my issues better than I can with a male. No idea why that is.
As far as the sex goes, if it happens, it happens, if not, oh well. I've already went almost 5 years without it. Not getting it before I ctb isn't going to kill me(pun intended).