Its commonly promoted in Movies (thanks to the Media world in the USA) that 'anal in women' is acceptable.
Heaps of guys poke their women in the back-door.
(Hence why they get a lot of UTI's, let alone transfer bacteria ...get it, 'back-teria'

- into the vaginal passage for another infection)
Well a lot of young women boast now of having 'turned' guys into enjoying anal with them, into enjoying anal with other guys - sometimes via a 'threesome' with him, her and her friend ...then the return volley of him, another guy and her.
Some women love 'ruining' guys a bit, for whatever reason?
Once a guy 'enjoys' anal with a 'her', it doesn't take much for him to go 'anal' with a guy.
Even Rachel Welch once said of the USA Media/Entertainment Industry (something along the lines of) "Sexually addicted and degraded that goes undisciplined"
So, as you can see. It's the Media that has pushed the 'Gay Marriage' all along and forced Politics to take it on board.
Remember when teenagers wore their pants down below their buttocks like the latest trend about 5+ years ago.
Well that was taken from the US/Mexican Prisons where guys who 'were available' to be analled, wore their pants half down.
So, if a woman asks you to 'anal' her...
Would you?