What if your GF/Wife wanted to be a substitute would U let her?

[Imconfused]

So I asked and he let me but not for long, after doing it, he told me that wasn't for him, but I could still use my finger in the future. I think he wasn't relaxed...if I didn't hold it, it would have shot right out.....
I think, he thinks I am into shemales...Which I am not saying it is a bad thing, it just isnt my thing. I wanted to do this for him because I thought that's what he wanted.
My user name is perfect because that is exactly what I am ...confused...I know that not all men like to penetrated from behind (if they like shemales) So I don't know what his extent of liking shemales is...You know does he just like to jerk off watching them or what...See the dvd he has...it is mostly men with the shemales but there are two scenes that there is two men with a shemale but one of the men is also penetrating the other man ( no not a shemale) If you were to take the shemale out of there...it would be just two guys $#$%ing each other...