IPA: //ˈæn.ti.sɛks//
KK: /ˈæn.ti.sɛks/
Opposed to sexual activity or the expression of sexuality.
The group's antisex stance was evident in their campaigns against explicit content.
Antisex is formed from "anti-" (meaning against) and "sex" (from Latin "sexus", meaning gender or sexual intercourse). The word refers to being against sexual activity or sexual relations.
Think of 'against' ('anti-') when remembering that 'antisex' means opposing sexual activity.