Someone just posted recently that their neutered male mounted and completed the act with her unfixed female who was in heat.
I was shocked because I had NO idea they could still do it! Obviously no risk of pregnancy but I guess they can still do it recreationally.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226