Do you thinks the slave owner, the ho*ny male, will not interested in having sex or married these Arab Moors female slave. Any sexual contact means the Arab Moors DNA will affect their descendant genetic forever. If you don't believe, just ask Borat .... sexy time.
The Christian kingdoms of Iberia frequently traded their Muslim captives back across the border for payments of money or kind. Indeed, historian James Broadman writes that this type of redemption offered the best chance for captives and slaves to regain their freedom.
The sale of Muslim captives, either back to the Islamic southern states or to third-party slave brokers, supplied one of the means by which Aragon and Castile financed the Reconquista. Battles and sieges provided large numbers of captives; after the siege of Almeria in 1147, sources report that Alfonso VII of León sent almost 10,000 of the city's Muslim women and children to Genoa to be sold into slavery as partial repayment of Genoese assistance in the campaign.
https://en.wikipedia.org/wiki/Slavery_in_medieval_Europe
And so do the ho*ny Castilian Knights and Warriors to 2,000 moslem slave (some of them certainly women).
An offensive by Alfonso VIII of Castile in 1182 brought him over 2,000 Muslim slaves.
https://en.wikipedia.org/wiki/Slavery_in_medieval_Europe