I have no data for this, so i'm just speculating wildly (and accepting this will be a unpopular conjecture):

Lemmas - Things I have data for

• Metabolic dysfunction is endemic in the population (96% westerners)
• Metabolic dysfunction impacts hormones, especially sex hormones
• Aromatase happens at elevated levels in metabolically compromised people
• This can manifest as man-boobs, love-handles, chin hair, etc
• Metabolic dysfunction is principally caused by diet.

Speculation - Things I have no data for

• There is probably some connection between sexuality and hormones
• There is probably some connection between sexuality and life-long diets

This means there might be a interesting correlation you could discover. However, I don't think anyone would fund this type of research, or publish it - it would cause controversy needlessly.

Seeing a population prefer vegetables doesn't speak to cause and effect, it could be a cultural appreciation for being healthy and vegetables are mostly seen as healthy by most groups.