Threesome thoughts, comments, & so on!

Britt. • I`m going to lay it all down.. I`m 20, in a long term relationship; I`m trying to conceive!
Considering a three way but just don't know, I mean it looks all hot and steamy in a porno.. But what about after who with & how to approach the "girl" to see about joining, how to express my desire to my man, and everything else! Have you done it, what was your experience ?