Friend of mine had a QH stallion who would not treat it as "just business" - he had to fall in love first. They usually put him and the lady of the moment in adjoining paddocks (with an access road in between) so that they could get acquainted. I'm surprised they didn't have a "perfesser" out there playing mood music on the bordello piano . . .
That's funny! We stood a world champion Tennessee Walking horse whose preferences ran for short mares (15.2 and under hands) with wide hips. If the mare was close to 16 hands, even in good heat, forget it.