Getting the Ick:

Edward Dutton:

"it would be adaptive that her realisation of his unsuitability would come to her in the form of a 'revelation' or 'epiphany'; a particula potent reaction which, due to its dramatic dimensions, would strongly emotionally impact her, forcing her to act upon it."

"These examples would ultimately all relate to concerns over his abilities, maturity, competence, mental stability and even his genetic health."

"From a female perspective, "getting the ick" is, clearly, highly adaptive. It ensures that you don't get pregnant by a suboptimal male."