The term "sex" has several related but distinct meanings depending on the context: 1. Biological meaning:
Sex refers to the biological classification of organisms based on their reproductive functions and physical characteristics, such as genitalia and chromosomes. Typically, organisms are classified as male or female depending on the type of gametes they produce—males produce smaller, mobile sperm, and females produce larger, non-mobile eggs. Some organisms can be hermaphroditic, producing both types of gametes. Sex is usually assigned at birth based on physical traits and chromosomes, such as XY for males and XX for females in humans

. 2. Sexual activity meaning:
In everyday language, "sex" commonly refers to sexual activity, especially sexual intercourse, which is the physical act involving penetration (most often vaginal intercourse between a man and a woman). However, the definition can be broader and include other sexual acts such as oral sex, anal sex, manual stimulation, and even solo masturbation in some views. Sexual activity also encompasses behaviors intended to elicit sexual desire, such as flirting or sending intimate messages. All sexual acts should be consensual and enjoyable for those involved

. 3. Emotional and relational meaning:
For many people, sex also carries emotional significance, symbolizing intimacy, love, acceptance, desire, and care within relationships. It can be an expression of vulnerability and connection beyond just physical pleasure

. In summary, "sex" can mean the biological classification of male or female organisms or the range of sexual behaviors and activities between people, often with emotional and relational dimensions as well. The exact meaning depends on the context in which the term is used.