Everyone must remember that the age of consent in Oklahoma is 16.
However, if you are older than 18, it's better to draw a mental barrier at 18-year-olds just to be safe....because if they look like they are 18 they are probably 16, and if they look like they are 16, they are probably 14.
“Age of consent” is the age when a person is considered legally mature enough to agree to sexual intercourse or sexual conduct with another person.
Some states, such as Florida and New York, set an age at which all sexual intercourse is considered statutory rape.
What is illegal is if one is a minor/below the age of consent and there is intimacy. In most of Europe the age of consent is 16 and below 18 a minor.
What the situation is in the US seems to rather depend on the laws of the State in question.
Age of consent laws vary widely from jurisdiction to jurisdiction, though most jurisdictions set the age of consent in the range 14 to 18.
The laws may also vary by the type of sexual act, the gender of the participants, or other restrictions such as being in a position of trust; some jurisdictions may also make allowances for minors engaged in sexual acts with each other, rather than a single age.