This article is interesting.
"Various myths regarding female sexual offending exist today....Another common misconception is that females are not primary perpetrators. However, multiple studies across time have identified females as primary abusers in up to 20% of sex crimes cases (Lewis & Stanley, 2000; McLeod, 2015)."
"The relational offender is less likely to use physical force or intentionally manipulative behavior. Instead, they believe themselves to be in an actual romantic relationship with their victim and behave accordingly."
The male victims of these relational offenders are the most unlikely to recognise what happened to them as abusive and/or illegal. That means they are least likely to formally report in a fashion that would align with conviction rates.
They are also called heterosexual nurturers in other studies and are thought to likely be the most common type of female sex offender if all crimes of this nature were reported.