Table 4.

Definition of constructs of sexual orientation as described in the results by the authors in this systematic review.

Construct used	Definition	Studies in chronological order
Sexual identity	The individual's self-conception of being homosexual, bisexual, and/or heterosexual.	Money et al., 1984; Mulaikal et al., 1987; Slijper et al., 1992; Kuhnle et al., 1995; Zucker et al., 1996; Morgan et al., 2005; Brinkmann et al., 2007; Liang et al., 2008; Meyer-Bahlburg et al., 2008; Frisen et al., 2009; Falhammar et al., 2012; Jurgensen et al., 2013; Lesma et al., 2014; Binet et al., 2016; Callens et al., 2016
Sexual inclination and orientation	Erotic sexual dreams and fantasies, active sexual experience, and sexual identity.	Dittmann et al., 1992; Gastaud et al., 2007; Meyer-Bahlburg et al., 2008.
Sexual attraction	Fell in love with/sexual attraction/sexual appreciation.	Ehrhardt, 1979; May et al., 1996; Jurgensen et al., 2013.
Sexual fantasies and dreams	Sexual fantasies, including crush in fantasies, and sexual dreams.	Ehrhardt et al., 1968a; Lev-Ran, 1974; Ehrhardt, 1979; Zucker et al., 1996; Lee et al., 2010; Khorashad et al., 2017.
Erotosexual arousal	Imagery/and or activity.	Money et al., 1984; Callens et al., 2016.
Sexual behavior/experiences/relations/practices/activity	Recent sexual behavior; frequent heterosexual and occasional homosexual experience; frequent heterosexual experience and frequent homosexual experience; heterosexual/homosexual in behavior.	Ehrhardt et al., 1968a; Lev-Ran, 1974; Zucker et al., 1996; Hines et al., 2004; Gastaud et al., 2007; Meyer-Bahlburg et al., 2008; Lee et al., 2010; Callens et al., 2016; Khorashad et al., 2017.
Sexual relationships	Heterosexual/bisexual/homosexual sexual relationships.	Ehrhardt, 1979; Zucker et al., 1996; Johannsen et al., 2006; Meyer-Bahlburg et al., 2008; Lee et al., 2010; Fagerholm et al., 2011; Jurgensen et al., 2013; Lesma et al., 2014; Callens et al., 2016; Khorashad et al., 2017.
Preferred sexual partner	Preferred gender of sexual partner	Kanhere et al., 2015.
Love relationships	Current love relationship	Dittmann et al., 1992; Jurgensen et al., 2013.
Preferred life partner and romantic interest	Imagined future romantic interest; fantasizing about wedding and marriage	Ehrhardt et al., 1968b; Gupta et al., 2006
Sexual behaviors and partnerships	Registered partnerships	Hines et al., 2004; Falhammar et al., 2012, 2017.
Life partner, sexual behavior, and fantasies	My sexual behavior has been with… My sexual fantasies have been with…	Lee et al., 2010; Falhammar et al., 2012.