Obesity, age, kids, higher status, and CPD (chihuahua personality disorder).
Kids are radioactive; only a real chump would want to raise another man's litter!
Obesity is obvious.
Age is less obvious, at least to women, who think men look at women the way women look at men. Unlike men, women are like cars-- they depreciate in value over time. Many women seem like used cars, especially once they hit thirty.
Higher status-- if a woman makes more dinero than me, that's a total turnoff. Women are the same way, but in reverse-- if a woman is "secure" with dating a lower status guy, then she's likely not playing with a full deck.