Why Do I find Curvy Women like Kirstie Alley ( In present form ) So Sexy?

Why do I love Curvy women so much? I don't understand this.. For example, I was recently dating this girl, who from the start of the relationship was very curvy.. Towards the end of the relationship she lost a bunch of weight and I sorta missed her thicker frame ? I really like thick thighs and a thick booty on a woman. Is that weird? Also, I'm a 29 year old guy, who is in good shape, I work out twice a day... What's with me!!??