I was into Malice Mizer in the early 2000s and that's Mana, the lead guitarist. He's a dude, not a lesbian lol
From Wikipedia:
Mana is known for wearing 'female' clothes. Mana himself has said that he wanted to be the ultimate onnagata [male actors who play female roles in kabuki theatre] ... His lack of speaking, combined with his commitment to 'feminine' dress, led to people believing he was actually female.
(I added the definition of onnagata because I didn't know what it was until I clicked the link)