Once a year, that very rare. I am proud to say we used NETTLES twice a week with my lovely 3rd wife and were never disappointed : the vigourous frictions of her nipples and vagina as well as my genitals were always deliciously 'painful' and we ENJOYED each time
The lovely thing about nettles is that although it is very painful, it is completely harmless to the health and the body recovers quickly from it. The bad thing about it, which I am sure you have found, is that the second time you use them, the pain is less and if you use them often there is a point they become painless. I try to use them less than once a year to ensure I can get the most pain from them.
Five days ago I understand your tits and opened vagina were well whipped with stinging nettles. Such a treatment is healthy and excellent for sexual parts of both male and female!... I am very proud to say that my lovely 3rd wife regularly RUBBED my genitals with fresh picked NETTLES. Using too on her boobs and her opened vagina, up to her clitoris and her labia of course. She ENJOYED as well as myself during more than 18 years without any interruption. I assume you are always enjoying too!