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Introducing the industry's hidden side the public never sees♪ Before filming, some actresses may have a tight vagina or worry about pain from sex after a long hiatus. In such cases, at the actress's request, there's a practice called “test insertion.” This involves inserting the male actor's rock-hard erection to stretch the vagina beforehand. During “test insertion,” sex begins in a private space with exchanges known only to the participants.

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