We (Wife and I) have gone from 2-3 times per week to twice a month, maybe 3 times, not by my choice. However, I masturbate and wear butt plugs to make up for the lack of sex. Not ideal but I won't pressure my wife into having sex when she's not interested.
When I see my boyfriend (once a month right now), it is every day the entire time I am there. Unfortunately, by the 3rd or 4th day I am sore and raw and just not a happy camper. So I assume when I move down there next month it will be an every other day kind of thing so that I don't hurt myself.