If it was in Germany or Italy and it was consensual, yes it would be legal.
"Argento quietly arranged to pay $380,000 to her own accuser: Jimmy Bennett, a young actor and rock musician who said she had sexually assaulted him in a California hotel room years earlier, when he was only two months past his 17th birthday. She was 37. The age of consent in California is 18."
https://www.nytimes.com › 2018/08/19 › asia-argento-***...
Huey. Would you want to be raped by a famous Hollywood actress that was 37 and you were only 17?