Threesome refers to two girls and one customer (be it male or female). Although you pay double you may only cum once for threesome. This rule is standardized throughout the world.
As mentioned, most men do not fulfilled their sexual fantasies and they owe it to themselves to be pampered.
As for ladies, most of them have never engaged gigolo service or sexual services such as (masturbation sessions, vibrator stimulation sessions, lesbians sex etc)