I feel like Tao ejaculation control provides good motivation for keyholders to lock their males. The Taoists speak of ejaculation:
Formula 1, numbers: Ejaculate two or three times per ten sexual encounters, no matter the age or season. Formula 2, season: Every three days in Spring, every fifteen days in Summer and Autumn, none at all in Winter. A relationship has its own seasons as well. Formula 3, age and strength: Teens to twenties: twice a day for the strong, once for the weak. Thirties: strong men once daily, weak ones every other day. Forties: strong are 1:3 (one in three days), weak are one in four days (1:4). Fifties: strong 1:5, weak 1:10. Sixties: strong 1:10, weak 1:20. Seventies: strong 1:30, weak none at all. Formula 4, age: Teens and twenties 1:4 Thirties 1:8 Forties 1:16 Fifties 1:21 Sixties+ 1:30