It is almost impossible to turn down sex with a naked woman no matter how bad it looks.
When alcohol is involved, yes.

I've only turned down a chick who was completely DTF once. I just had no attraction to her at all, she was following me around all night at my brother's house; i knew she wanted to get laid. She started giving me a back massage in the hot tub and had an "accidental" swimsuit malfunction, flopped her tities out right in my face. She was just too skinny and pale for me, had no ass and while being skinny, she still had cottage cheese legs.

Just couldn't do it. I had to hide from her most of the night and took an Uber to a friends house instead of staying at my brother's place. She would have raped me. My brother still gives me shit because i didn't bang her, he thinks she's hot and i think she's ugly as hell. I just don't like skinny women.
Now i've banged my share of chubby girls though.

Not denying that. 3 years ago this lady i worked with introduced me to her friend at a house party. She was about 5'4" and 150 ish pounds, massive DD's that were pierced, very nice legs, but she was a bit chubby. Probably a 4-5 on a typical scale of attractiveness, but had a pretty face. We had been drinking all day and i knew she was down, so her and i went around the corner of the house to smoke a joint, her nipples were rock fucking hard because we'd been in the pool. I could see the piercings, i just asked if her nipples were pierced and she flopped a tit out and showed me. I just started playing with them and ended up banging her in the backseat of my truck.
I nailed this chick 2-3 nights a week for about 6 months, she never wanted to do anything other than drink wine and bang for hours. Only went out in public with her twice.

Once i started dating a new whore i said goodbye, she still wanted me to bang her, but that's not my style.