Des：``Sperm donation is an act in which ordinary men donate sperm to couples who are struggling to conceive. This time we feature a couple who have been married for four years. The wife, Mai, tries to convince her husband about having direct sexual intercourse with the donor by saying, ``Its less of a burden on the body, but the preparatory massage ignites his lust. In the end, they have sex themselves, let out a sweet voice, and fall into serious sex...