Several recent studies have been conducted on the gender differences and personality traits of BDSM practitioners. Wismeijer and van Assen (2013) found that "the association of BDSM role and gender was strong and significant" with only 8% of women in the study being dominant compared to 75% being submissive.; Hébert and Weaver (2014) found that 9% of women in their study were dominant compared to 88% submissive; Weierstall1 and Giebel (2017) likewise found a significant difference, with 19% of women in the study as dominant compared to 74% as submissive, and a study from Andrea Duarte Silva (2015) indicated that 61.7% of females who are active in BDSM expressed a preference for a submissive role, 25.7% consider themselves a switch, while 12.6% prefer the dominant role. In contrast, 46.6% of men prefer the submissive role, 24% consider themselves to be switches and 29.5% prefer the dominant role. They concluded that "men more often display an engagement in dominant practices, whereas females take on the submissive part. This result is inline with a recent study about mate preferences that has shown that women have a generally higher preference for a dominant partner than men do (Giebel, Moran, Schawohl, & Weierstall, 2015). Women also prefer dominant men, and even men who are aggressive, for a short-term relationship and for the purpose of sexual intercourse (Giebel, Weierstall, Schauer, & Elbert, 2013)". Similarly, studies on sexual fantasy differences between men and women show the latter prefer submissive and passive fantasies over dominant and active ones, with rape and force being common.