That Is How It Is For Me

I read on here about a guy who was asking if guys had an erection and ejaculated during anal sex. I can’t answer for all guys, and I’m not gay but just occasionally bisexual with a friend.
But I always have the stiffest erection while I’m being butt fucked, although I have been fucked when I did not have an erection, which was mostly because I was only being accommodating and not really turned on.
I have ejaculated spontaneously a number of times . It was like I was just so excited and turned on that I just couldn’t help it or keep that from happening. Usually I think that this was in anticipation of the moment, and almost right after my friend put his penis in me. When that happens I really squirt and it goes about four or five feet. One time it went eight feet! We measured.
But to sum up, typically in my case, being butt fucked always gives me a super hard erection and I prefer doing it either on my hands and knees, or standing, in both cases getting it from behind. I have tried it many other ways, lap sitting and facing, but those are the best positions for me.