FIRST FOOD FOR SECOND THOUGHTS...Not trying to alienate anyone...or anything...

Helpful Highlights from gayhealth.com:

Your mouth leads to the back of your throat… when you swallow, your trachea closes to prevent liquids and food from going down the wrong windpipe… Your gag reflex is another safety mechanism designed to keep your airways free of solids or liquids... when something solid hits the back of your throat, the nerves stimulate muscles to contract violently. When severe, your gagging can even precipitate vomiting.

Mastering the fine art of a blow job often involves learning to deal with your gag reflex.

Gagging should only become a problem when something hits the back of your throat. Your gag reflex is heightened when your stomach is full, so if you've had a problem with gagging in the past it might be better to do it on an empty stomach ‑‑ unless your boyfriend doesn't mind being covered in vomit.

Your genital area has many sweat glands that give off that musky and sometimes musty smell. If you notice a less than fragrant aroma emanating from your loins, a bit of pre‑fellatio soap and water can do the trick. Just remember to rinse thoroughly to prevent a soapy aftertaste. Uncircumcised men must pay particular attention to hygiene ‑‑ especially if your partner is nervous...

During oral sex, be careful of cuts, scrapes or infections… your partner's mouth is full of bacteria... Virtually any STD can infect your throat. STDs in your mouth often begin as a sore throat several days after sex … Gonorrhea can be asymptomatic in his mouth and easily pass to your urethra during fellatio. Bacteria that are naturally present in a partner's mouth can also infect your penis, causing a urethritis.

I wish I could tell you that oral sex is definitely safe... When HIV first hit the gay community, researchers interviewed thousands of men to try to determine what sex acts caused infection. In the early 1980's, virtually every man was having unprotected anal and oral sex… Unfortunately, some men lied about the kind of sex they were having. Many other studies have shown that oral sex does have a small risk (much less than anal sex) of transmitting HIV. Small risk does not mean no risk… As more men have protected anal sex, the risk of catching HIV from unprotected oral sex will become more significant.