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The hormone testosterone (T) plays a key role in male mating effort, the time and energy devoted to pursuing mates and besting same-sex competitors (Ellison, 2001). Higher T levels facilitate male pursuit of females, and T levels increase a er interacting with an attractive woman (Roney, Mahler, & Maestripieri, 2003). Maintaining high levels of T, though, can be costly for men. T can compromise immune functioning, and because it is linked with mating effort, it may interfere with parenting effort (it’s difficult for a man to be a good parent if he’s always pursuing other women). Consequently, evolutionists have hypothesized that T levels should drop a er a man succeeds in attracting a long-term mate, and studies have found precisely that effect (Burnham et al., 2003; Gray et al., 2004). One study found that men in committed relationships had 21 percent lower T levels than unpaired men (see Figure 5.6). Another found that men in long-term relationships (more than 12 months) had substantially lower T levels than single men or men in newly formed relationships (less than 12 months) (Farrelly, Owens, Elliott, Walden, & Wetherell, 2015). Married men who had children had even lower levels of T.
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