Ah, the joys of cruising the back roads of the Internet. Putting "female flagellant" into Google brings up mainly kinky sex websites. "Female flagellant medieval" brings up http://orb.rhodes.edu/encyclop/cultu...tion/MK28.html
with its reference to a female flagellant figure in a medieval Danish wall painting.
VELJBY, AARHUS c.1490. 28-41. Devil. Choir, north arch.
Devil plagues woman. Center, woman churning is plagued by devil.
Left, two devils carry basket by rod put through loops, rod on
their shoulders. Right, a female flagellant with birches and
scourge, shows bare breasts.
And we're back at kinky sex again.
Try "men women flagellants medieval". Ah.
1. In 1259 the Flagellants appeared. By a kind of mass contagion men, women, and children bewailed their sins and many of them marched through the streets, naked except for loin cloths, crying to God for mercy, and scourging themselves until the blood ran.25 "They proclaimed complete certainty of salvation to all who should persevere in flagellation for thirty-three days. Scourging was the one necessary sacrament. They were condemned in 1349."
So it looks like, yes, sometimes it was both men and women.