Few. You need to use condoms to decrease your risk of stds. Female condoms are available it your partner won't wear a condom. Male condoms are actually fairly effective as a form of birth control provided they are used correctly. The condom must be on from the moment of erection since the penis does secrete some fluid with sperm before ejaculation.
Condoms. There are some possible disadvantages to use of a male condom. The first would be if you were allergic to the material it is composed of (I.e. latex) Some men report decreased sensitivity when wearing a condom. There may be a temporary halt to sexual activity when it is being applied to an erect penis. With poor attention to detail when using, efficacy can drop to around 85%.