you need a healthy shot of self esteem let it go.
you don't wake someone up cause your trippin.
just nicely remind him that what you do together is none of your brothers business and if your brother actually listens theres something wrong with that boy (he's your brother smack im up side the head)

lol yea.... i know.... and as for my brother listening yea.... no comment but it defiantly bothers me.

i have brothers too all younger ages ranging from 18-35 sometimes brothers ar just total jerks lol

Gee! If they're best friends, I think they'll probably just keep telling each other whatever they want -- which may or may not include any sexual references as regards your relationship with your fiance!!
Why does it bother you? I'm not implying that it shouldn't, just wondering what it is about it that bugs you!!
Is it just the 'ick' factor of it all, or is it going to create a real problem, like some outsider coming down on you or something?
Sigh. All you can do is ask your fiance to please not discuss your love life with your brother, that his doing so makes you uncomfortable and then hope that he will respect your request.
And then, maybe you're only bothered because it's kind of new to you. As time goes on, you may find that you don't give a crap about it at all, anymore!!!
I hope it all works out, anyway!!!!
Take care and have fun!!!!

It's not so much it's my brother that he's talking to or even that all this is new to me it's more that it is all a secret to me what my fiance has said to my brother. My and my "sister-in-law" talk about her and my brothers relationship and that doesn't bother me. He knows everything that she's told me it's not a secret. I mean hell we'll all sit down and bs and talk about it all and I'm fine....