I agree that the Breeding skill and actual breeding could be tweaked/improved because in my game the VV'ers who make the most trips into the Love Shack have the Highest levels regardless of whether they have bred(made a baby) on the trip or not. As other posters have noticed this means it's a lot easier for men to get high levels of the skill.

Also I think it's kind of unfair that mothers can't gain any skills when they're nursing; basically for two game years a woman with a baby can't improve in any way - which can keep them at lower levels than the men, especially if you get a gender-imbalance in the village and there aare more men than women.