There are two meanings of the word 'sex' - the activity of sexual interaction; and the biological sex of a person.

Sexual interaction

Biological sex (XX or XY)

Sex is your biological sex (according to chromosomes and secondary sexual characteristics); gender is the role that you perform in a social context.

Judith Butler has pointed out that sex is just as socially constructed as gender.

Why does our society regard sex/gender as a primary social category? Why not star-sign, or time of day that you were born, or totem animal?
What about people with chromosome combinations other than XX or XY?
Why are boys encouraged to develop their muscles, but not girls? These are physical sexual characteristics that are subject to social factors.

The focus of contemporary Paganisms on the divine feminine and goddesses has gone hand-in-hand with the rise of feminism.
Ironically, the “Great Mother Goddess” was an icon for social conservatives like Jacquetta Hawkes
Both men and women are beginning to appreciate the diversity of deities and archetypes
Queer theory is also beginning to have an impact on thinking about gender and sexuality
Pagans celebrate consensual sex between adults. The boundaries are very clear: people should not have sex with someone younger than themselves if they are in an unequal power relationship (e.g. teacher/student, doctor/patient, trainer/trainee, employer/employee) even if they are over the legal age of consent. Consent consists of clearly given consent without any form of coercion, whether physical or mental. No means No.