From the internet and her own mouth, Monica Lewinski was of-age and what happened in the Oval Office was totally consensual (it's in her book).
The bullying and abuse of power came from online trolls AFTER she admitted to it.
Anyway, there's nothing in the law of the land that says Trump can't get laid in the Oval Office, but like almost 30 years ago with Clinton, it's just not proper etiquette.
Moot point anyway as it's just unlikely that he may find anyone willing to participate (for free).
Apart from Mark Meadows, maybe?