This is a politically incorrect and anti-Genderist but scientifically correct point of view:
The correct meaning of the term Sex in Biology is Insemination. Insemination is the Fusion of a Sperm cell and an Egg cell to a Cygote (inseminated Eg cell). The term Gender means that what we would call the biological Sex and not the psycho-social Sex like Pseudo-Scientists, the so-called Genderists like Judith Butler claim.
A psycho-social Sex doesnt exist independently from the biological Sex (which is correctly called Gender) by the way.
Both terms Sex and Gender are originally terms of Biology and the Pseudo-Scientists who call themselves Genderists only reframed their corect definition.
So the semantical conclusion is that something like Homo-Sex cant exist because Homosexuals arent able to biological Reproduction.
The correct term for that what we call Sex or better Sexual Activity in the everyday language is actually erotical actions or actions of Eros (the meaning of the old-greek term Eros is love-making in physical sense).
Only Heterosexuals can have Sex (insemination). There is no Homo-, Bi-, Trans- or Intersex.
Homosexuals are just People with a homo-erotic preference and Bisexuals are People who have a hetero- and a homo-erotic preference but these People are able to biological Reproduction because they have not only a homo-erotic but also a hetero-erotic preference.
The correct term in Human Biology and Medicine for Intersexuals is People who suffer from a Gender Development Disorder and those for Trannsexuals is People who suffer from a Gender Identity Disorder.
Gender Studies is just a Feminist Pseudoscience which is based on the irrationalist Philsophy Social Constructivism and which Subject of “research” are the specific problems of People with a homo-erotical prefrence.
Trump has to take the Hungarian Premier Minister Orban as a role model of a wise Statesman because he banned Gender Studies from the Universities.
https://edition.cnn.com/2018/10/19/europe/hungary-bans-gender-study-at-colleges-trnd/index.html