it's a matter of breast size... i find large breasts disgusting because it suggests moocows who happen to be barefoot and chained to your kitchen.
Being attracted to prepubescent children is just as bad as homosexuality from a Darwinian PoV, postpubescent/pubescent children is mostly cultural since they can get pregnant or get you pregnant.
In medieval Europe, with 35 year Life Expectancy, as soon as you became pubescent you went looking for pussy or cocks, so you could start a family unit before you die of plague.