The last five years have been a series of relationships between a month and a couple of years. I'm sure this beats one night stands for quantity of sex.
I spent six months with a woman I saw maybe two or three nights a week. We fucked every night and all morning on weekends.
I spent 18 months with a woman who I had little in common with other than sex. We spent maybe five nights a week together and fucked every night, often going to bed by 9PM for weird nights where we'd fuck for an hour, sleep early, wake up at 3-4AM and fuck some more or sleep through until 6 or so and fuck before her kids woke up. Again, weekends alone were mostly fucking and sleeping. This was a very hard relationship to walk away from as constant sex with a much younger curvaceous nympho who worshipped my cock pretty much fulfilled all my fantasies...
I also spent a month or so with a woman who, I'm pretty sure, had my hard cock inside her for over half the time we were awake together. It seems to me that most women are seriously up for a lot of fucking at the start of a relationship.
I've now been with the same woman for over two years and things have been up and down but we're back up to fucking maybe 2 out of 3 nights, just a shame she isn't into morning sex and we only spend a couple of nights a week together. Still more than the once a week pre-planned sex I had toward the end of my marriage though...