Is it normal that I am obsessed with the female butthole?

I became obsessed with the female butt when I was 13 I spied on my neighbor across the street she was a 38 year old woman who was about 5'8" and 230lbs and she has a big butt and she was in her room on the bed with her panties down and she was putting her finger up her butt and and then she got up and got up and went on front of a mirror and bent over and spread her butt apart and she look back and saw her own butthole and the next day I saw her letting her dog lick her butt and then her husband got home and then few minutes later he came in and saw her and he layed on the bed and she bent over and spread open her butt and showed her husband her butthole and he was getting horny and he started jacking off and she moved closer to him and pointed to her butt and then he got up and smelled her butt and spread her butt and he smelled her smelly, butthole and then he put his dick up her butt and started fucking her in her butthole and she masturbated and rubbed her pussy while being fucked up her ass and then he cummed and I w a jacking off my dick the whole time and I cummed in the grass