Sexcapades: Anal doesn't count as sex! Right?

Okay, so my high school boyfriend who I dated for a little under three years was autistic, and I have my suspicions about me and autism. We were both quirky peas in a pod, and he was admittedly good in bed after we had a few hands-on lessons with his fingers and my vagina :) 
 
Anyway, he had this weird timeline in his head and didn’t want to have sex until we were 18. Okay cool, we were 15 at the time so whatever. Fast forward to 17, we’re sexually frustrated and were probably ready to do more. But he was firm on his timeline. 
 
One weekend he’s over at my house and we’re laying there spooning after oral sex when I felt his dick coming back to life, so I kinda began teasing and grinding against him. 
 
He suddenly got up and revealed he swiped a condom from his dad. I was confused, but he explained that anal and vaginal sex weren’t the same, and that it was okay for him to fuck my ass since it wasn't really sex (hello, anal SEX?). If I didn’t know that he was agnostic, I totally would have thought it was him trying to find some sort of loophole LMAO.  
 
I agree to it, and he’s back on the bed in record time and gripping my hips as he pushes himself into my ass. To be so honest, it fucking hurt. It was nothing like my Schick razor I was using, but with some breathing and comforting from him, I relaxed enough and he got it in. 
 
It was turning me on to have him gripping my hips and fucking my ass, so all in all pleasant enough — up until he switched positions. Trying doggy style while it was our first time doing anal was a horrible idea. The pain was next level for me, and even with lube it just didn’t work. We tried to go back to laying on our sides, but the moment ended pretty soon after.  

We should have just had P in V sex at that point instead of messing around with anal.