There's something my fiance does sexually I don't like?!

tell him straight out- The one thing that I don't understand with women is that you DON'T say how u feel unless in a situation that u are rude- then u forget tact.
TELL HIM- be tactful but direct. Tell him in a way that you would want someone to tell you- but be direct.

Why would it be wrong? Just mention it the next time you guys are talking about it.Or if it's too uncomfortable to bring up, maybe just the next time you guys are messing around quickly stop him and say you don't really like it that much right before he tries to do it again. Either way it will probably end up taking up five seconds for you to just let him know not to do it anymore.

I used to do that with my gf when she asked me to finger her and id act like i was stupid and slip em in her *** and say "whoops" then she said if i did it again she would never blow me again so no more "STINK FINGER".... Try anal beads some girls don't like anal sex or fingering in the bum-bum but they love the beads

Granted, anal play isn't for everyone and there are a LOT of pure hang-ups over it, however......
.
Ask the women who have gotten past the "ooooh, it's gross" part and ask if the orgasms are any good..? Chances are they will tell you they have some of the most poweful EVER, once they "let go" of childish stigmas..!
.
But, to each their own. Stick your finger up HIS butt and see what he does..

It isn't wrong at all. What's the point in doing something that the other one doesn't like? Every time my boyfriend and I do something new, he always checks to make sure that I'm comfortable, that I like it, and that it doesn't hurt me.

tell him what you like and then if he says "What about when i put my fingers in your butt" say im not keen on that and it doesn't turn me on.

Tell him you like everything except that.

No. Tell him that anal play doesn't turn you on.