(Koss et al., 1987; Koss, Heise, & Russo, 1994). In college and community samples, rates of self-reported rape perpetration range from 6% to 15%, and rates of sexual assault perpetration range from 22% to 57% (Abbey et al., 1998; Calhoun, Bernat, Clum, & Frame, 1997; Koss et al., 1987; Muehlenhard & Linton, 1987; Rapaport & Burkhart, 1984; Senn, Desmarais, Verberg, & Wood, 2000).

Source

Calhoun et al. [1997] surveyed 65 young men in a rural community in Georgia who had recently participated in a study of school-aged youth. The average age of participants was 19 and most were Caucasian. Twenty-two percent of these men (n = 14) had perpetrated some type of sexual assault based on their answers to a modified version of the SES; 6.4% had committed an act that met standard legal definitions of completed rape

Senn et al. [2000] surveyed a representative sample of 195 men in a small Canadian city. Participants ranged in age from 19 to 82 and most were Caucasian. Using a modified version of the SES, 27% of participants reported committing some type of sexual assault; 7.7% reported committing attempted or completed rape. M

One large noncollege study was conducted with a special population. Merrill et al. [2001] surveyed 7,850 male US navy recruits from three different locations. These men were on average 20 years of age and approximately two-thirds were Caucasian. Using a shortened form of the SES, approximately 11% of these men reported that they had committed an act that met standard legal definitions of rape.

Source for previous three

So yeah, there’s quite a few different studies…all of them paint a pretty dark picture. They are self reported, so the number could potentially be even higher.