This has varied a great deal for me over the years.
Recently over the last two years I'd say it was once every week or two weeks on average.
Prior to that, I'd say it was once every three to four weeks.
A couple of factors that shifted my mongering rate included budget constraints, and who I was dating with at the time. There was this girl I dated for a couple of years who was a fantastic fuck and I didn't have to get my jollies off somewhere else most of the time. We were just sexually compatible in so many ways.
I was also making less money when I was younger, had more debt, so luxuries like this were held back a bit.
I suppose if I had unlimited money to monger, I'd be at it about two to three times a week. Maybe some of you other brothers could take it on with a new girl everyday.
To make things clear, I consider mongering any activity where LB gets off. This could be full on sex, a quick BJ, or just a rub and tug.