How do you GET STIs?
The usual way is through

Sex

Semen, vaginal fluid and blood can all carry an infection.

The man doesn't have to ejaculate (‘cum’) to infect a partner. A small amount of ‘pre-cum’ can leave the penis before or without ejaculation, and can be just as infectious.

And you don’t even need to have ‘full sex’. Some STIs can be passed from person to person by genital contact alone (when the penis just touches the vulva or vagina).

Some STIs (including herpes) can also be passed from person to person through oral sex (when you lick or kiss your partner’s genitals).

For crabs and scabies (which are crawling insect-like creatures), skin contact alone is enough.

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