Who knew?
After hearing the comments on the radio show, I did find these links, but not sure how much credibility to give them?
https://selfhack.com/blog/unhealthy-ejaculate/
https://www.newscientist.com/article/dn2457-semen-acts-as-an-anti-depressant/
I note this in the first linked article: "Like anything you take in, make sure your supply source of semen is trustworthy and free of STDs."
Any comments, including that I've noted that some of the ladies here on Lush are nurses and so maybe have some knowledge of this?