Given the nature of the subreddit /r/sex, individuals who browse /r/sex may be even more "sex-positive" or open about sex than other participants who volunteer for sex research, resulting in greater acceptance of casual sex, more experience with casual sex, or even greater sexual satisfaction (see Wiederman, 1999, for a review of self-selection bias in sex research). 91) than for all other participants (3.45), t(246.2) = 3.87, p < .001. Mean scores for SOI-R Desire were also higher for those recruited from /r/sex (2.88) than for all other participants (2.63), t(472) = 2.26, p = .03. No significant differences emerged for mean scores on SOI-R Behaviour: 2.48 vs. 2.54 for /r/sex participants and all others respectively, 1(472) = -.53, p = .60. Finally, there were no significant differences for mean sexual satisfaction between those recruited from /r/sex (3.91) and from more traditional methods (3.91), t(242.6) = .92, p = .36.

An ANOVA revealed significant differences in mean levels of sexual satisfaction across the five relationship types, F(4,470) = 3.57, p = .01. Although the Test of Homogeneity of Variances was significant, Levene statistic (4, 470) = 6.79, p < .001, the Central Limit Theorem suggests that ANOVA should be robust against this violation with a large enough sample size (i.e., 95 in each group; Stoddard, 2010).