It took me 15 years of marriage to convince my wife do it (I took her cherry when we were 1
so it was her first ever other cock, watching them going at it was a real turn on, sinking my cock in her when they finished was pure heaven knowing she had another cock in her.
That opened the door to 30 + years of fun for us, it was fun watching my 35 year old wife exploring her new found sexual freedom.