Unfortunately the information in the article is correct - even blowjobs carry a risk of infection. In fact, the term 'unprotected sex' refers not only to penetrative sex but also to the genital-mouth variety.
The risks of infection are not as high but you'd still be mad to ignore them. STDs such as herpes, syphilis and gonorrhoea can be transmitted easily through oral sex and even chlamydia can be picked up this way too. It's possible (though not certain) that Hepatitis C too can be passed on this way.
So far as HIV transmission is concerned, oral sex is thought to be a less risky activity than anal or vaginal sex, but it's definitely not risk-free. Bear in mind that STDs are not simply passed on through semen and vaginal fluid but also through small nicks in the skin that allow infections to pass directly into the blood supply of the uninfected individual. Risk of catching a disease from oral sex is therefore highest if you have cuts or sores in the mouth or on the gums, or if you're suffering from a mouth or throat infection which is causing inflammation.
So, to wrap up, I'm afraid that unless you're certain that your lover is in perfect health, it's important for you to use a barrier when you give him a blowjob. Why don't you give flavoured condoms a go? They're a lot more palatable than the regular kind. If I tell you there's a kind of rubber called a Chocdoms, do you start to see the appeal? (For more on fruit and choc-flavoured condoms, check out the range sold online by Condoms Direct - (www.condomsdirect.co.uk).
A final word: even when you do use a condom for oral sex, it's important for you to observe good oral hygiene and avoid oral sex if you have any cuts, sores or ulcers in your mouth, or on your gums. Also, if your boyfriend ejaculates in your mouth, either spit it out quickly or swallow quickly. Don't swill it about in your mouth, as your oral cavity is the prime route for STD transmission. Does this all sound like too much hassle? If so, why not end all speculation on your boyfriend's infection status by sending him to a GUM clinic for a sexual health check-up? It could make life a whole lot simpler!