|My wife and I have done this three times with two different guys we met through adult friend finder. It was very erotic and I tell you my wife and I have a strong relationship. You really have to be commited to each other and trust your spouse. The first guys was very well endowed (Porn Star Like) and the other guys was just a bit longer than me but just about average. The really enjoys the sex but insists she does not need this in her life or for our marriage. She has expressed she only does it for me but will enjoy it to the fullest for that time shot in time. She has recently told me she does not want to do this again. I'm the persistent one. More to come.
Hope this helps.