[tlover]

I wouldn't worry too much most of the guys here love females and are not gay.
What turns us on about shemales?
That's quite complex, i think for me its the beautiful femiminity of the female with the fascination of the hard erection and slight masculine side.
I think most men have a bit of a fascination with there cocks and other men's cocks but don't get turned on by the male sex.
So the female form coupled with the cock is irresistible.

I think most men get turned on by the idea or the fantasy but wont admit it.
As for him rather being with a shemale, i think you will have to expect this is just another side of his sexuality, he may want to have sex with a shemale or just fantasize about it, it doesn't mean hes going to leave you for a shemale.
Many men here have wives or girlfriends and just visit shemales now and then, his might just be a fantasy.

How did you find out and how long has his interest been? i think you need to talk to him about it.

I agree with Ex that at first when you discover a new sexual interest or fantasy it can totally consume for a while but this eventually passes and things will probably return to normal eventually, so i wouldn't worry too much just yet, let him indulge for a while until it eases.

What about your fantasies mabey you should talk to him about yours, mabey you could work each others fantasises into the relationship.
Why should he have all the fun.