It’s important for many reasons. IIRC, Vitamin D is involved in the adrenal-thyroid link. A deficiency can trigger hormonal imbalance problems for both men and women.
big pharma will try to disprove it by the usual two pronged approach...at best it wont help, at worst you can overdose and have side effects.
meanwhile the warning label for Viagra tells you (no kidding), if you go blind or deaf, get help immediately.