I started punting early (18), simply because I was as randy as fuck, bored and lacking in choice of available women/girls. I continued on and off, but have given up when in relationships, other than over the last 4-5 years when late wife's health issues meant punting was a more obvious/kinder avenue than an affair - I did not want emotional attachment, I just wanted physical intimacy.
Whilst the late OH from time to time discussed that I should perhaps visit WGs, I don't know if she suspected or knew that I was. However, she recognised that I had a physical need, which she, sadly could not provide. Would be great if more women were like that.
Whilst visiting WGs clearly falls into the infidelity bracket, I think there's a definite punter mentality that enables some people (self included) to seek physical thrills elsewhere, yet still manage to be invested in a loving relationship, just one that doesn't necessarily provide as much intimacy as we would like. Certainly I'm one of those who views it very much as a service akin to visiting the barber, etc.