Barbas is a large gray hunting dog found along the road outside Falkreath. He is Clavicus Vile's companion, a supernatural creature that usually takes the form of a dog. Barbas cannot be harmed during the course of gameplay, except by the Rueful Axe.
Um if sex can't cause a miscarriage neither can masturbation. I mean your not sticking a coat hanger or razor blades up there... I'm sorry about your miscarriage and get you're grasping at straws but you didn't do anything to cause it and if you're going to have one now there's not anything you can do to prevent it.
However, if premature ejaculation is not an issue, avoid frequent masturbation as it can lead to weak erections due to decreased sex drive or sexual appetite. The more semen discharged so often, the weaker the sex drive even when taking volume pills. There should be a GOOD BALANCE when and not to masturbate.