Back in the 1970s, many people, both straight and gay, enjoyed
sex with a variety of partners assuming that there was very little danger.
Unfortunately, this is no longer the case. It is only sensible to practise safe
sex.
What is safe sex?
The only totally safe form of sex is masturbation. All sexual
activity with a partner carries some risk, though the danger of infections is
practically non-existent if the two partners are completely faithful to each
other.
Petting with the hands is a relatively safe form of sex; it is much less risky than intercourse. However, if you are going to have sexual intercourse with someone who is not a regular, faithful partner, you should ALWAYS use a condom. This can be either a male condom or, (much less commonly), a female one. The condom should be worn THROUGHOUT the entire act of intercourse - putting it on when you are halfway through is simply asking for trouble.
Other 'barrier methods' of contraception, such as the diaphragm or cap, do offer some protection against the transmission of infection, but very little.
If you are only having oral sex, this carries rather less risk of transmitting sexual infection, but most certainly can happen. For this reason some people prefer to use either a condom (for fellatio) or a rubber barrier sheet, called a 'dam', if they are having cunnilingus.
One of the greatest risks to your health is having sex when you've drunk too much alcohol. Many people who normally practise safe sex have become pregnant or have contracted HIV or venereal diseases through having unprotected sex while drunk.
If in doubt as to whether it would be safe to have sex with someone - don't.
Good advice