While the group is talking about Miku, they talk about how stats skyrocketed when she came into contact with AST and peaked when she met Origami.
Another person brings up that she hosts concerts only for women and that there’s rumors she brings some of her fans back home, implying she was sleeping with them.
As far as I’m aware, there’s never been confirmation in the anime or light novel for if Miku actually had sex with those girls. But after her scenes with the “gender bent” MC before she realized he was a guy, it’s strongly implied she at least did some erotic things with those other girls off-screen.