I'd say, the line where "persuading" ends and "pressuring" starts is blurred.
By widening definition of rape (pressured into coitus against will) one could get to rather surprising results:
Twelve-month sexual victimization prevalence (percentage) among adult population (noninstitutionalized) from the National Intimate Partner and Sexual Violence Survey 2010, and among adult and juvenile detainees from the National Inmate Survey 2011–2012
CDC's National Intimate Partner and Sexual Violence Survey (NISVS), one of the most comprehensive surveys of sexual victimization conducted in the United States to date found that men and women had a similar prevalence of nonconsensual sex in the previous 12 months (
1.270 million women and 1.267 million men)
CDC NISVS Report
My personal take is, that if my spouse wants it and I don't, I give in, it's not a rape. The same stays if roles are reversed. That is what majority of those 1.27 million women and 1.26 million men have experienced, I think.
Anyhow, if one pushes for wider definition of rape, he/she must also admit that based on government stats it's not a gender issue... at all.