scaredy slut
Someone who is promiscuous, but afraid of adventurous sexual activity.
"They banged three different people last week, but we invited them to a sex club and they chickened out. What a scaredy slut!"
"He talked big game about what he was gonna do at the gangbang, but he flaked because he's afraid of being near another dude's dick. Total scaredy slut."
"He talked big game about what he was gonna do at the gangbang, but he flaked because he's afraid of being near another dude's dick. Total scaredy slut."