Are you sure that this is the case? Increase in RECORDED rapes and sexual assaults could be because of an actual increase in the events, or it could be that more women are feeling safe enough to report them. It could also be due to a definition of what constitutes sexual assault broadening over time. These three things could all lead to the same numerical outcome (increase in recorded rapes and sexual assault) but the argument that men are becoming more violent to women over time relies on the answer being #1. If it’s actually caused by #2 or #3 then this is a different conclusion. Be careful with statistics.