Should I Have Threesome?

Hi all ladies,

me and my gf has been discusing about having threesome which is ffm. And she has agree to proceed with this. A part of this she also said she wanna watch me f*** another girl right infront of her.(is that true? Sometimes ladies feel that way?)

however I would love to hear from all the ladies speking from your expirence.

Even after I have already expirence ffm threesome, should allow her to have her expirence of a mmf threesome or I should just stay selfish.

Pls. I ladies and wife's out there, I need your advice.
For your information, we've try and done many kind of way of having sex, such as intro pron into our sex life, sex toy's, kitchen sex, bathroom sex, sex in the water and even shot a movie of our's and watch after sex, except this threesome.

Thanks in advice.