I'm about 165. I say that I don't want a woman who weighs more than me.
Also I don't like being with women who are much taller than me. If she's 5'9" thats ok and 165 is a good max weight for that height, IMO. If she's a bodybuilder and ways more thats cool, just not my thing.
Of course, smaller than 165 is better. but a greenhorn like me can only ask so much.