A healthy sex life is natural, whether it's proper sex or masturbation, it feels great either way, I understand you aren't primitive but so many primitive idiots who shun sex and I cba with them...
I mean, i'd maybe do it if we were raising money for cancer awareness or domestic abuse or something, but doing it for the reasons said in this thread seems a bit weird.
I notice you said "possible benefits", because it's mostly about a persons mentality, whatever they believe to feel/think, that's what they will feel/think in most cases, not saying there aren't benefits, but there are also benefits to a very active sex life too.