I'm writing a speech on sexism, as it is a topic which quite often gives rise to disputes and heated discussions; is there an adjective to describe such a topic which does so?
You could use controversial.
: relating to or causing much discussion, disagreement, or argument : likely to produce controversy
Examples of Controversial
- Abortion is a highly controversial subject.
- a decision that remains controversial
- He is a controversial author.
Some other alternatives would be:
Controversial:can convey the idea of an issue or argument, especially one concerning a matter about which there is strong disagreement and especially one carried on in public or in the press.
- Of, producing, or marked by controversy: a controversial movie; a controversial stand on human rights.
Contentious is probably what you're looking for:
con·ten·tious adjective \kən-ˈten(t)-shəs\
: likely to cause people to argue or disagree
: involving a lot of arguing
: likely or willing to argue