with how vain the woman is, and how often she uses the dragon balls to make cosmetic wishs... why does she not just wish to be a Saiyan, or for eternal youth? that way she remain as beautiful as she wants for as long as she wants. and if she becomes a saiyan? she could finally understand and keep up with Vegeta. even better? he might be more inclined to spend time with her.
something tells me the site of Bulma as a saiyan with a tail? is likely to rev Vegeta's engines from zero to "MUST BREED!" in less then 5 seconds.