The argument that asexuality is not a real or legitimate sexuality because “sex is a biological need,” or something similarly worded, is bullshit.
It is also one step away from saying “reproduction is a biological imperative,” which implies sex is primarily done for reproduction…which kind of rules out a lot of the LGBTQIA community as well as people who, ya know, have no desire to ever reproduce or are sex-repulsed for whatever reason.
You cannot survive without consuming nutrients and liquids. You CAN survive without sex.