he wants anal the first time you have sex?
This.
Quite weird and to me quite horrible.
The very first time you have sex, it's ass sex. What a lovely start to the full physical side of a relationship, not.
What struck me is that he then, having seen you were in pain with it, couldn't continue, didnt enjoy it at all (and no wonder) .... Asked you to do it again not long after/the very next day !!!!!! WTAF.
Also to me, noone who is not attached to men, needs to say "I'm not attracted to men but ..". It's a given, it wouldn't even occur to heterosexual men to say it/need to say it.
But his sexuality blah blah..... Something major is going on with him.
He's not fit for a relationship, he's not fit for good sex, and also he's a cheeky, rude, disrespectful c*nt essentially throwing you out of his parents place early after inviting you for the weekend.
Run in the other direction. This guy is a fucking mess.
You don't need to be around being treated like shit and pandering to his special snowflake baval.faxing issues, whatever the fuck they are.
He's fixated on anal sex (which lets face it, is nasty for most women), had ED, is shit at sex and is a flaky, rude, fucked up header into the bargain.
I'd stop communicating with him at all.