Trust me I understand your
Trust me I understand your concern. This is not something I've done on a whim I've got friends that run a stud service and yes with 24 years experience I've forgotten more than most have experienced. The viagra NOT needed for stiffness of his cock as I'm well aware of the baculum.
Male canines are one of the few animals that have a locking
bulbus glandis or also known as a "bulb" or "knot", a spherical area of erectile tissue at the base of the penis. During copulation, and only after the male's penis is fully inside the female's vagina, the bulbus glandis becomes engorged with blood. Viagra does assist in keeping this process occurring and fully enlarged for a longer amount of time when breeding.