Men are from Mars and Women are from Venus...
There are some men who have strange fantasies, like threesomes, etc...
which are a bit weird,
there are some men who just want to have flings...hey, I even heard once on the Jerry Springer Show that a guy wanted a 3some on their honeymoon night! pfff...
Love is so very complicated, and we should ask ourselves...is that really love?
and after all this...there are still men who know what love is about : two people who love each other, who don't want another to satisfiy there fantasies or needs, because they know that the gem that they've been lookin' for is right there in their arms...
Where you are, it's not really a Win Win situation...
If you say NO...he's probably going to want it even more(like when a mum says no to their child because they want some candy...the child screams and wants it even more), or cheat on you...(maybe not, I don't know you're husband)
If you say YES...well...blablabla...you go through the 3some and what do you know...you're husband will probably find it cool...because well let's face it : all men are pigs...(by the way...I'm a guy)...
I don't know what's happened with the world...but I find that for most people love is all about sex, or cheating or wanting another party in bed with the couple...
It shouldn't be like that...love is...well...just like the love stories...
So if I were you, I would say NO...it's disgusting, and besides...you're husband will look at that other person in another light...(and in most cases, it's not to hate)