Marital coital rates and dominance

Are heterosexual pairings in which the male is dominant more satisfactory? Coital rates of couples in which husbands were younger than their wives were contrasted with those in which husbands were older, but there was no significant difference. However, the data were not controlled for duration of marriage, and for a constant spouse-age-sum, couples with the husband the younger marry later on average than do the others. So whether younger-husband couples have lower coital rates is undecided.