Why do we get the ‘ick’?

So you’re going out with someone, and it’s all going fine, but then they do something… It could be something small, something they’re wearing, how they eat their food, but it gives you the ‘ick’ and puts off any romantic feelings you had for them. Why do we get the ‘ick’? Is it our fault for getting it, or is it just instinct making the right decisions? Emily Power Smith, Clinical Sexologist and Sex Therapist joins Seán to discuss.