Some boys "are more easily excited excited by slow, firm strokes; others like them light and quick." (p.262)
A boy will be "stimulated by mere sights and sounds, or by erotic fantasies and anticipations" while girls are much less susceptible to these factors and consequently need more purely physical stimulation (p.55,57)
In the 'sex is only for procreation' vision, intercourse is "just like the mating of cattle. There is no room for refinement and cultivation. Indeed, any attempt at such refinement is a perversion of the 'natural order'. Man may strive to perfect himself in all other spheres of life, but in his sexual activity he must never rise above the level of the beasts." (p. 198)
cited by Brongersma 1990, p.282, 361, 392