Sexual (adjective)

1. Relating to sex or the sexes.
2. Relating to the instincts, physiological processes, or behavior related to sex and reproduction.
3. Relating to or involving sexual activities or desires.

Origin:

Early 17th century: from latin sexualis, from sexus "sex".

Examples:

1. The sexual behavior of the animals was studied.
2. The sexual reproduction of the species was observed.
3. The sexual attraction between the two individuals was obvious.
4. The sexual abuse of the children was reported.
5. The sexual orientation of the person was not relevant to the job.