SOS: Sex

I have a question for you freaks and lovers,
So my boyfriend and I recently started having sex, a lot, like a LOT of sex. Just about every day, maybe even twice a day... well maybe three. You lose count when it's that good, ya feel? 
Anyways, he recently told me he was having a little issues downstairs with his disco stick. It almost looks like a rash but kind of like a sun burn... or just dry skin. Any ideas? 
We haven't gone to the doctors yet, we are on day five or so... we bought some "diaper rash" ointment stuff to try out but any input would be appreciated. 
Probably gonna go visit the doctor soon and he'll be going alone because looking a doctor in the eye and telling him WHY this happened is definitely a babe job. 
Really want this resolved soon because I miss his sweet lovin all over me, well all in me... 
So any help is APPRECIATED. 
Thanks, 
💋C