You gut feelings are the result of a million year evolution, your reasoning of a few millenia, your culture from few decades.
An example could be your gut making you feel that there is something wrong, a sense of discomfort and frustration yet you convince yourself that given enough time spent listing her bull**** and spending in drinks will make the two of you intimate.
One of the best thing I learned is that the gut is rarely wrong, while you dont smell pheromons, notice all the small facial expressions and body language, you gut does, and knows best.