Larry Niven covered this in 1974's, "Man of Steel, Woman of Kleenex" which discusses the impracticality of Superman/Clark Kent having sex.

The problem is this. Electroencephalograms taken of men and women during sexual intercourse show that orgasm resembles "a kind of pleasurable epileptic attack." One loses control over one's muscles.

Superman has been known to leave his fingerprints in steel and in hardened concrete, accidentally. What would he do to the woman in his arms during what amounts to an epileptic fit?

Consider the driving urge between a man and a woman, the monomaniacal urge to achieve greater and greater penetration. Remember also that we are dealing with kryptonian muscles.

Superman would literally crush LL's body in his arms, while simultaneously ripping her open from crotch to sternum, gutting her like a trout.

https://www.rawbw.com/~svw/superman.html

And if you clamp those steel cheeks you create the paradox between an immovable object vs an unstoppable force. Turns out super humans also get the super shits.