I've passed this request on to my "go to sex guy", a friend/colleague with a Ph.D. in Human Sexuality and knows more about sex than I've forgotten (which is considerable at 55).
I will be away for a week starting Thursday, so if he emails me directly, I won't have the answer til I get back. I gave him the web address and if he registers and posts directly, you'll have the best answer you can get for free right there. Hopefully, he will register and jump in from time to time.
Blissfully retired after 35 years treating sexual abuse