There is plenty of erotica stories and art of super heroes in text, cartoon, art and even cosplay but more often than not, they don't use their powers with the act. Which just ends up conventional sex and little imagination. Likw
Fantastic Four. Sue Richards has a definite dark side and married to Mr Fantastic who can stretch his dick into a python or stripper pole. or loop overhead so she can swing naked on it or do the ultimate deep throat in one hole and out the other and shoved into her final hole or turn someones costume or armor invisible to check out their junk.
The Incredibles Elastigirl could take The Washington Monument in any hole all the way. or be impaled like an accordion on Mr Incredibles shaft all the way thro one hole and out the other.
The possibilities are endless but barely explored