<human>: EDIT: Ooops, I ment (54m), mistake sorry.
I know some comments are going to tell me to back off cause hes my dad, and I know couples sometimes watch porn together but he does this differently. 
2 months ago I caught my dad watching porn off his iPad, but he didn't see me, so I know that he watches porn but he doesn't know that I know. And umm, Some of the descriptive titles weren't pleasent, (this girls name) blah blah blah getting blah blah. He is not doing it occasionally, **usually**. I sometimes see him bring his ipad or iphone in the bathroom who knows what. It really disgustes as I (18f) barley watch porn and I don't even have a gf. 
Religion: In our religion, Porn is a major sin especially when your marries. "it is adultery for your eyes". 
The worst part is that he does it behind my moms back, **seeing other naked girls while they can get naked** just disgustes me. 
I have to say, everytime I look at him my brain says to myself "oh look, its him, watching porn behind your moms back". 
I know there is science research that all men watch porn but not when they are 50 and happily married. I really don't know what to do. 
And recently on our families Amazon account, I saw these stripper clothes, cuffs. So I am afraid that he is putting my mom through this.

And I have to say, he is very bad with me and my siblings. He always shouts and smokes. and sometimes I just think he's just some horny person craving sex. Don't forget the amount of vaginas hes seen because he is an OB/GYN and delivers babies.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Dad watches naked people, mother doesn't know, I know he watches but he doesn't know that I know. He doing very bad thing.