Physical appearance is just a part of being together. Can both of you click emotionally or logically? Some girls are quite big boned so it is not easy for them to appear slim regardless of how they diet. Some tried to exercise to slim down but end up building thunder thighs.
Many guys here probably married a slim lady who turned into dino bu (as you called it) after a few childbirths. Then how? Have to live with it right since she lost her figure giving you children.