It seems like people like to pair them for three days, then give them 3-5 days off. So put him in with one female for 3 days max (unless you see a lock, then you just remove him), then give him 3-5 days off. Then to the next female and repeat. It is pretty common that they will lock within the first few hours, but when you remove him still give him the break before placing him with the other female.
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