For the source text click/tap here: Sanhedrin 66
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One who cohabits with a young maiden is not liable to be stoned unless she is young (naarah), virgin, betrothed, and still in her father's house. A naarah is a girl of twelve years old who has sprouted two pubic hairs; she remains a naarah until she is twelve and a half. Virgin - but if she had intimate relations, their punishment is standard - strangulation.
Betrothed - the first stage of marriage (kiddushin) has been performed, but there was no hupah, so she is yet not allowed to live with her husband. If two men cohabited with her (anally), the first one is liable to stoning, and the second one - to strangulation.
We explore intimacy within marriage and without.