I have been married for 34 years. My wife and i had good but unspectacular sex for 32 of those years. After years of trying i finally convinced her to try MMF.
She loved it. She found that other guys were very attracted to her, even though she was 60, and she had great sex with them.
Better sex than she had ever had with me.
Gradually the MMF turned into MF with me watching.
The last year i have been pussy free and wear a chastity cage for longer period of time.
Now i wear a chastity cage when my wife is cuckolding me with other guys, they all like to abuse and humiliate me both physically and verbally.
It started with forced oral on the guys, with verbal humiliation, particulalry SPH, as well as being spanked.
The above has continued , but now it has also developed into me being tied up both face down and face up and used however my wife and her lovers desire.
No severe pain, blood or watersports.