Not to rain on anyones party, but rubbers won't protect you from some of those STDs. Rubbers are only good at protecting you from STDs transmitted primarily through sperm, and to a lesser extent, vaginal fluids.
Herpetic lesions, for example, can spread the Herpes Simplex virus through mere contact with that lesion and a mucous gland, basically your lips, tip of penis, anus and vagina. The increase in the popularity of cunnilingus, or oral sex, for example, is responsible for the rise in genital herpes virii infecting the oral region and vice versa. Previously there was a distinction between the HSV variant that infected the genital area, and that which infected the oral area. That distinction is being blurred. Obviously a condom will not cover a herpetic sore on the vulva or vaginal area, nor will a condom cover a cold sore on your lips. It is estimated that close to 70% of Americans, for example, carry either HSV-1 or HSV-2 (oral/genital herpes). The rates in other countries are probably similar, if not worse.
Asymptomatic shedding of the HSV-1 or HSV-2 virus means that you can catch cold sores or genital herpes from individuals not displaying symptoms of the disease, specifically sores. Even without the visible presence of sores, the virus is still present on the skin - meaning you can catch it from having sex or kissing someone infected with it, but otherwise apparently healthy.
Pubic lice can also spread regardless of whether you wear a condom. They just spread from close physical contact.
Then, of course, there's the big one - HIV.
Many STDs are unfortunately incurable. Herpes, for example, can be treated, but never cured. The virus remains dormant in the nerves of the infected individual, occasionally flaring up. HIV too, is known to be only treatable but otherwise incurable. Then there are the permanent side effects, like sterility, which syphilis can cause if left untreated or, more worryingly, unnoticed. A Hepatitis infection, for example, has been positively associated with certain liver cancers later on in life.
The sad truth of the matter is that abstinence is still the best policy.
Despite what Hollywood makes you believe, sex is still risky and not a risk-free-and-fun activity (although the latter is true). Pamela Anderson is known to have Hepatitis C, a primarily STD-form of hepatitis, with the source suspected to be her ex-rocker boyfriend. So yes, even stars get infected with such diseases.
A good place to start learning about STD's is afraidtoask.com
For those who are diplomatic enough to spin it properly, it is probably a good idea to get a full blood test from your partner before engaging in any of the above activities.