3. They are real
In modern times, it can be very hard to see who is real and who isn’t. But most irresistible people are an authentic version of themselves. They don’t go around making stories up, nor will they brag about something that did not happen. In fact, they are the most real people you can find and they are very upfront about anything and everything. This honesty will make you feel more attracted to them and make them more trustworthy. And the last time we checked, a trustworthy person is quite irresistible.