Because you can.
The aliens told us to comply within ten hours, or face destruction. We had to give them all our men. Forever. As bull studs.
Some men showed up. The female aliens weren’t ugly, after all. But a surprising percentage of men preferred life with thier families, thier lovers, thier jobs.
We thought we had time to prepare.
The countdown clock had two hours left when we noticed the translation was not ten hours, but “two hands of hours”.
The aliens looked a lot like us.
They had four digits on each hand.
We heard lasers, held our spouses, and prayed.