I don't know Craiglist since I never was a fan of those kind of online services that sell pretty much everything, even my grand mother's dirty underwear. With everything you do on the web you've got to be careful and vigilant and it is even more true when you're looking for sexual services (or just sex) because your health could seriously be jeopardized. For me, it doesn't matter on which online services you are signing on; people on the Internet are continuously "coating" the truth and there's not many ways for you to verify it.
So you want to place an ad for a blowjob? Congratulation! Now you worry about diseases? Well, here's another congratulation for you, this means that you are aware there could be danger. Before I tackle the part where you should be careful with what you will get from online hookups or dating let's come clear with the disease part.
For HIV to be contracted by oral sex - blowjob (taking in consideration that it's all clean, with healthy gums and treated cavities) it would take roughly 7 liters of saliva for you to contract HIV from fellatio. And it will need to be drunk. In an average on a 24 hours, 7 liter is what one single human being produces of saliva. So wants HIV or any other STD from saliva, spit in a bucket every few seconds for the whole day, and at the end of the day drink it up... still your chance will still be quite minimal to contract an STD.
Quote:An individual secrete saliva at a rate of approximately 0.5 milliliters per minute. Multiplying 0.5 milliliters by 960 minutes in an average 16-hour waking day amounts to 480 milliliters of saliva in 16 hours. This is only an estimate since various activities such as exercise, eating, drinking, and speaking all increase salivary volume.
Your mouth, nose and eyes are one area that contains an impressive amount of white blood cells, now if you do recall you basic biology courses, white blood cells are the Interpol police of your body. So you can be certain that a lot of them are presents in any part of your body that deals with external incoming. Saliva is composed of 95% water and the remaining 5% is a mix of electrolytes (cells shit lol), mucus (yep same has what you find in your hand when sneezing - if you've learned to cover - but in far less quantity), and enzymes (proteins produced by living cells).
Now you are going to ask what this whole biology crap has to do with getting a blow job or being possibly infected with STD, simple, your body has a very good protection policy, however, if you're getting blown by a guys with a very poor oral hygiene, you may get some problem since your gland is a sponge and therefore is composed of very microscopic hole that will welcome many type of bacteria, the only time however those bacteria are considered STD is if the person blowing or being blown has oral or genital herpes. Once you have herpes, it's for life, it can disappear for years but yep through your life it will come back again and again, and bad oral hygiene being in contact with your penis may just trigger it. However do recall that once a oral herpes is transferred to your penis, it is not called a "cold sore" anymore, it's called genital herpes... and it is much more painful than a "cold sore." Herpes is very contagious and it remain contagious until it completely disappear.
But AIDS, Hepatitis B and C are not catchable by oral sex. Now here's something you need to be conscious about. I don't know for Craigslist but I have a feeling that's it's worst there since the ads are free and any Joe, Jack and Mark can post and say whatever and there's no way of reporting them or verifying them, but if someone claim to be clean you might want to ask them more question.
- When was the last time they've got tested?
- Did he has sex between the time he was tested and the last sexual encounters?
- How many partner have he had in the last three months?
- If he's so certain that he's clean, each clinic (even the anonymous one) can provided a certificate proving that one has been tested for HIV, Hepatitis and other STDs.
- Would he agree to be tested (nowadays test are done anonymously and the result practically comes right away) what's 1 hour of your life to have a great 10 to 20 minutes blowjob LOL.
Other solution if you're not too certain, use sheep skin condom... but I don't think you'd have lot of interested parties with that one.
In all and all dude, just be careful... The road to hell is paved with good intentions! And online dating is your MODERN HELL.