It is possible for sperm to be present within the fluid that comes out before a man has sex. Semen is made up of sperm and seminal plasma, and of the seminal plasma, prostate fluid is an important component. Before sex, after the penis is erected, men are likely to have a clear, clear fluid coming out of the urethra, usually prostate fluid, which can serve to facilitate sex to take place. It is possible for sperm to be present in this fluid, and it is also possible for it to lead to a woman’s pregnancy. For some men who want to contraception during sex, should be in the sex on a good job of contraception, such as the use of condoms, etc., can not be first sex, to be about to ejaculation and then use a condom, so that the effect of contraception is generally not very good.