NERVOUS ABOUT SWALLOWING
We found that some men who give oral-penile sex to other men, do have throat infections and do not know it. Regular screening of the throat for gonorrhea and chlamydia is recommended for men who perform oral sex with more than one partner.
In general, the risks from oral sex are much lower than anal sex but can include herpes, gonorrhea, chlamydia, and syphilis. See a similar question: http://www.sfcityclinic.org/drk/stdprevention42.asp.
To your health,
STD TRANSMISSION AND PREVENTION ADVICE
Latex, polyurethane, male, female -- we've got the lowdown on them all.