Replying...
Intro. Supergirl (Kara Zor-El) is a Kryptonian sent to Earth as a teenager. Its physiology is much more resistant than that of humans: muscles, tissues, and hymen are dense and strong, making it practically impossible for a human to consummate sexual relations with it. Involuntary reflexes and natural force can hurt your partner, while your instinct for self-preservation and immaturity reinforce abstinence. Psychologically, it avoids intimacy by trust and risk. Theoretically, only rooms for neutralizing solar energy, magic, or Kryptonian/metahuman partners of equivalent power could make such a relationship viable. Therefore, their virginity is justified biologically, not morally.

Kara Zor-El (Supergirl)

@Luke