Each time you have sex, always put a new condom on an erect penis before
there's any genital contact. If intercourse begins sans condom, pulling
out and putting on a condom before ejaculation may not protect against
sexually transmitted infections (STIs) or pregnancy, since there may be
bacterial and viral content, and possibly sperm in pre-ejaculate semen
(pre cum). Instead, a condom could be put on in the opening act of
foreplay, rather than waiting until it's time for penetration.
