IPA: /ɪˈrɒtɪkəl/
KK: /ɪˈrɑtɪkəl/
Relating to or tending to arouse sexual desire or excitement.
The novel contained many erotical themes that explored human relationships.
Comparative: more erotical
Superlative: most erotical
Erotical is derived from "eroticus" (meaning pertaining to love or desire) from Greek "erōtikos" (meaning of love) which comes from "erōs" (meaning love or desire). The word "erotical" refers to something that is related to or arousing sexual love or desire.
Think of 'erōs' which means love or desire, to remember that 'erotical' relates to things that evoke or pertain to love and desire.