Let us reveal an unexpected side of the adult industry's behind-the-scenes mechanics. Before filming, some actresses may have tight vaginas or feel pain during sex, especially if it's been a while. In such cases, at the actress's own request, there's a practice called "test penetration," where the male actor inserts his rock-hard erect cock to help her vagina adjust. This intimate act takes place in a private setting between just the two performers, unfolding as a secret, sensual process known only to those involved.