Yes, a good number of times when I was in my first marriage (open / swinging) and lost my virginity in MFF.
HYE had an affair?
No, while I enjoy a wide variety of sex I've always been more private about my activities even when I was an active swinger / open marriage (though certainly more public then than now). Plus I wouldn't want to turn sex into work. I'd rather just focus on the pleasure not a camera.
HYE flashed a stranger?