Being pansexual means you don't have to worry that someone might be of a gender that you aren't attracted to, only worry that you are a gender that they aren't attracted to.
panesexual people don't care if you're male, female, trans, gender queer, genderfluid, nonbinary, etc. they are pretty much just attracted to anyone, no matter what they're gender identity is.
The attraction to multiple genders. Bisexuality and pansexuality are forms of polysexuality. Polysexuality generally rejects the idea of a gender binary, the idea that there are only two genders (male and female), rather than a spectrum of genders.
Contrary to popular belief, transgender people do not necessarily fall outside of the gender binary, as they often still identify as just male or female.
Polysexuals do not necessarily engage in or support polyamory, or having multiple romantic partners.
I am attracted to women and people who identify as feminine, so I identify myself as polysexual.