Anything that's related to reproduction can be described as sexual. It's also used to describe an intimate kind of attraction that occurs between people.

Sexual reproduction happens in animals (including people) when a female's egg and a male's sperm fuse together and go through a process of cell division which results in a baby — or a litter of baby animals. People also use this adjective for things that are connected to or suggest sex, in both the "intimate contact" sense, and also the physical differences that define men and women.

Definitions of sexual
  1. adjective
    of or relating to or characterized by sexuality
    sexual orientation”
    sexual distinctions”
  2. adjective
    having or involving sex
    sexual reproduction”
    sexual spores”
    existing or occurring between the sexes
    having sexual differentiation
    relating to only one sex or having only one type of sexual organ; not hermaphroditic
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    asexual, nonsexual
    not having or involving sex
    agamic, agamogenetic, agamous, apomictic, parthenogenetic
    (of reproduction) not involving the fusion of male and female gametes in reproduction
    reproducing by fission
    neuter, sexless
    having no or imperfectly developed or nonfunctional sex organs
    vegetal, vegetative
    (of reproduction) characterized by asexual processes
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  3. adjective
    involved in a sexual relationship
    synonyms: intimate
    marked by or tending to arouse sexual desire or interest
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