Women want to have sex too.

Literal

Women [even-だって] sex want-to-do.

A short, frank statement. だって here is the emphatic 'even X,' 'X too' — 'even women [want sex].' Used to counter an implicit assumption that only one side of the topic holds. The verb phrase エッチしたい uses エッチ (the H-letter euphemism for 変態/sexual content) as a noun, with する turned into the desiderative したい ('want to do'). This is slang-register and deliberately casual, but easy to understand.