Hey! I'm not sure what you mean. Attractiveness is per save, so switching saves wouldn't persists your Attractiveness choices between them. I'm not sure what you mean by generating attractiveness keeping the same traits, what are you expecting to be different? I don't know what you're attempting to do and what you select during generating matters.
For example, let's say I generate this sim preferences and choose random, my sim will let's say be attracted to red heads with long straight hair, etc. But if I click generate again and choose random again, my sim will still be attracted to red heads with long straight hair, etc but it's like that across the board.