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No restriction on study design.<\/jats:p><\/jats:sec><jats:sec><jats:title>Data collection and analysis<\/jats:title><jats:p>Inclusion decisions, data extraction and quality assessment were conducted in duplicate. Meta\u2010analyses were carried out, with subgroups as appropriate.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main results<\/jats:title><jats:p>Of 6859 papers identified, 104 full\u2010text articles were requested, 30 papers (28 studies) were included. The odds ratio (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>) of ever being pregnant was 0.19 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 0.18\u20130.21) in lesbian women and 1.22 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.15\u20131.29) in bisexual women compared with heterosexual women. In the general population, the odds ratio for pregnancy was nine\u2010fold lower among lesbian women and over two\u2010fold lower among bisexual women (0.12 [95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 0.12\u20130.13] and 0.50 [95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 0.45\u20130.55], respectively). Odds ratios for pregnancy were higher for both <jats:styled-content style=\"fixed-case\">LB<\/jats:styled-content> adolescents (1.37 [95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.18\u20131.59] and 1.98 [95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.85, 2.13], respectively). There were inconsistent results regarding abortion rates. Lower rates of previous pregnancies were found in lesbian women undergoing artificial insemination (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content> 0.17 [95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 0.11\u20130.26]) but there were higher assisted reproduction success rates compared with heterosexual women (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content> 1.56 [95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.24\u20131.96]).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Heterosexuality must not be assumed in adolescents, as <jats:styled-content style=\"fixed-case\">LB<\/jats:styled-content> adolescents are at greater risk of unwanted pregnancies and terminations. Clinicians should provide appropriate information to all women, without assumptions about <jats:styled-content style=\"fixed-case\">LB<\/jats:styled-content> patients\u2019 desire for, or rejection of, fertility and childbearing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Tweetable abstract<\/jats:title><jats:p>Review of likelihood of <jats:styled-content style=\"fixed-case\">LB<\/jats:styled-content> women becoming pregnant: <jats:styled-content style=\"fixed-case\">LB<\/jats:styled-content> teenagers at greater risk of unwanted pregnancies.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.14449","type":"journal-article","created":{"date-parts":[[2016,12,17]],"date-time":"2016-12-17T11:54:56Z","timestamp":1481975696000},"page":"393-402","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":56,"title":["Lesbian and bisexual women's likelihood of becoming pregnant: a systematic review and meta\u2010analysis"],"prefix":"10.1111","volume":"124","author":[{"given":"K","family":"Hodson","sequence":"first","affiliation":[{"name":"Queen's Hospital Romford Essex UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C","family":"Meads","sequence":"additional","affiliation":[{"name":"Department of Health, Social Care and Education Anglia Ruskin University Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S","family":"Bewley","sequence":"additional","affiliation":[{"name":"Division of Women's Health Women's Health Academic Centre King's College London and King's Health Partners St Thomas\u2019 Hospital Campus London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,12,15]]},"reference":[{"key":"e_1_2_6_2_1","volume-title":"Looking for Lesbian Motherhood. 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