Never heard that theory before. But I can tell you much of what you post is totally incorrect.I'm heard guys saying in DR that a man gets infected if he has PIV(penis inside vagina) sex with an infected woman and he ejaculates inside her.
Anyways, I see that people in DR are very aware of std's and condom use is more of the norm than the exception.
If Dominican men believe in this ejaculation explanation, then they know that not using a condom is risky, since they can ejaculate nside a vagina unexpectedly, and thus at risk. ( and ofcourse, a condom reduces risk for herpes,hpv,chlamydia,syphillis,etc,etc)
I've never heard of this anywhere else. If is harder for a man to get infected with the virus, this might be a logical explanation.
I've never heard of the exact " mechanics of infection". I thought once that somebody can contact hiv if vaginal fluids where around the skin of the penis, but apparently, the virus gets inside thru the uretha. ( this is assuming there is no cuts on the penis, that makes contact with the vaginal fluids).
During sex education in hs. They always talked about " vaginal fluids", but they never said , how the vaginal fluids get in thru a penis.
the " ejaculation" explanation is that the vagina fluids of an infected woman gets mixed up with the semen of the man,and can swim into the uretha.
If a man doesn't cum, or maybe " pre-cum", then the risk of contracting the virus thru PIV(penis inside vagina) sex is very reduced.
What the experts here say about that?
HIV/AIDS is a blood-borne opportunistic infection. It has to get into the bloodstream to replicate. So unless a man has a cut/sore/bad abration on his tool, the odds of getting infected are miniscule. That is why anal infections are so common: tissues there are easy to tear in that type of sex.