It is important to remember that it is usually impossible to have entirely safe sex with another person.
But there are some other things you can do to help protect yourself from catching an STI / STD:
Other considerations
It is important to remember that most methods of birth control do not protect against STD’s and STI’s.
The birth control pill (The Pill), vasectomy, tubal ligation, contraceptive coils, diaphragms, contraceptive foams and gels, sponges and other contraceptive methods do not offer any protection against contracting and STD or STI. Whilst condoms (both male and female) do provide good protection against pregnancy and STD’s / STI’s) they are never 100% effective.
Pulling out prior to ejaculation (coitus interruptus) when the penis is withdrawn from the vagina, anus or mouth before ejaculation is not safe and does not prevent either pregnancy nor the possible transmission of STD’s / STI’s. Even before ejaculation, the penis can release pre-ejaculate fluid which can carry bacteria, viruses and other disease causing organisms, and it can also carry sperm which can lead to pregnancy.
Alcohol and other drugs
It is important to remember that if you have drunk to much alcohol or have taken drugs, your judgement may be impaired and your ability to resist having unsafe sex may be reduced.