How to Say "having sex" in Spanish
The Spanish word for “having sex” is “cogiendo” — C1 level. This is a very common word in everyday Spanish.
English → SpanishC1
verbC1slang
vulgar/slang

Examples
Ellos se estaban cogiendo.
They were having sex.
Reflexive use
When people use this to mean sex, they often add 'se' (themselves) to show it's happening between two people.
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