Because he was pretty.

You explain to Siegfried just how smitten you were upon seeing a photograph of him. But as soon as you start describing how beautiful his silver hair is, you notice his stone-faced expression, and freeze up immediately. Siegfried stares you down with his crimson eyes. "Forgive me for asking... But are you some kind of homosexual?" In your eagerness to praise him, you seem to have completely forgotten just how taboo speaking to other men like that was, regardless of how pretty and feminine they are.

Before you can explain yourself, Siegfried grips your arms and pulls you towards himself, pressing your body against his sizable bosom. Despite how feminine he is, Siegfried still has the strength and vigor of any other soldier. As he continues to stare you down face to face, Siegfried begins to blush. "I-I know my appearance is that of a woman's, there's no changing that..." He looked away before leaning in further to stare you down. "But if you consider my appearance beautiful, you should remember that my manhood is still intact!" His intimidation backfired, as Siegfried accidentally brushed his aforementioned manhood against your own. Even though he was just semi-erect, he was a few inches bigger than you. His eyes widened.