Lesbians aren't turned on by men.
A woman who isn't turned on doesn't want to have sex, even if there's a penis and she likes things penis-shaped in her vagina.
It's one of the reasons why heterosexual women don't enjoy being raped by men, even though they like penises. They aren't turned on and they don't want to have sex with him, so they didn't want his penis and they didn't want to have sex with it, even though they like other penises.
If a person isn't turned on by men, then the fact you have a penis doesn't matter to her. She just doesn't want to have sex with you.