How often do guys keep sexfriends?

In my previous relationship, my boyfriend kept a sexfriend... long story.. I was naive and when I found I ended things.. when I trying to figure out about that thing... many male friends told me that in their youth they did threesome, others had sexfriend etc.. I kind of learn and grew to understand that it is normal for guys to do these stuffs. Today I have a crush however the situation cropped again... he has a sexfriend.. he did not tell me but I discovered it... he knows the girl since 2015 and they are high school friends but have sex regularly.

So so I want to know how often do you guys keep a sex friend?
How often do guys keep sexfriends?
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