page_title: Parental investment
section_title: Investment as predictor of mating strategies
hierarchical_section_title: Parental investment / Parental investment in humans / Investment as predictor of mating strategies
caption_attribution_description: English: Chance of fertilization by menstrual cycle day relative to ovulation, with data from two different studies. Reference: &#32;(1999).&#32;"Day-specific probabilities of clinical pregnancy based on two studies with imperfect measures of ovulation". Human Reproduction&#32;14&#32;(7): 1835–1839. DOI:10.1093/humrep/14.7.1835. ISSN 1460-2350.
context_page_description: Parental investment, in evolutionary biology and evolutionary psychology, is any parental expenditure that benefits offspring. Parental investment may be performed by both males and females, females alone or males alone. Care can be provided at any stage of the offspring's life, from pre-natal to post-natal.
  Parental investment theory, a term coined by Robert Trivers in 1972, predicts that the sex that invests more in its offspring will be more selective when choosing a mate, and the less-investing sex will have intra-sexual competition for access to mates. This theory has been influential in explaining sex differences in sexual selection and mate preferences, throughout the animal kingdom and in humans.
caption: Chance of fertilization by menstrual cycle day relative to ovulation, with data from two different studies.
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