Sex is not taboo. The context is significant in using and applying the word "sex." It could mean the biological gender to identify a person. It could also mean sexual intercourse, which is not a taboo but something special, that comes with pleasure and designed by God for married people.

Most plants and animals use sexual reproduction. So sex is definitely not designed by a human god or for just married people. Gender and sex are two different concepts. Gender is about social stereotypes. Sex is decided at birth - except for intersex babies who are very rare but have both male and female genitals. Sexual intercourse is a mating act that we see in nature. The trusting action employed by the male is typical of mammals. Usually the rear entry position is used. But humans have adopted the missionary style because it allows for the upper body lovemaking - kissing and caressing - that women prefer to more explicit genital stimulation. Men enjoy other positions where they can enjoy the visual turn-on of viewing the genital interaction. The taboo of sex - which stands for any sexual activity - is due to the wildly different sexual responsiveness of men and woman as well as misunderstandings about orientation. We do not choose consciously what arouses us. Sexual response is instinctive and is a vital function of male reproductive function. Hence why female orgasm was only discovered relatively recently by scientists rather than by couples in the general population. Female orgasm is associated with clitoral stimulation and women's solitary masturbatory activities. Please see nosper.com if you are remotely interested in understanding sexuality.

Navigating a challenging area of research

"Fraught societal debates, particularly surrounding gender identity, are raising questions about how to best take sex and gender into account in research, both in studies of human health and in other contexts. At the same time, scientists are increasingly recognizing that they must move past assumptions that findings from mainly male individuals will apply to everyone. The articles in this special collection, with contributors who work in fields such as neuroscience, psychology, immunology, cancer and global health, explore the value of considering sex and gender in research, as well as the perils and pitfalls. They explain why progress in this long-neglected area of research is crucial — and consider how differences between individuals can be explored responsibly, inclusively and for the benefit of as many people as possible..."

https://www.nature.com/immersive/sex-and-gender-in-science/index.html

Thanks but my field of research is sexual response. I don't have much time for gender, which involves how a person identifies with the perception of male and female in each culture. These are just stereotypes. We are each unique and different to everyone else on the planet.