My relationship with Jessica sparked a change in me. Suddenly, the petty concerns and ridiculous obsessions of women in their early 20s just didn't cut it anymore. Even though I'd had two relationships with girls my age, their insecurities and constant need for reassurance over trivial matters were exhausting compared to the confidence of older women.

Being with older women quickly became something I enjoyed. I knew that the relationships had no emotional foundation or future but that didn't deter me. My cougar magnet days had begun.

After Jessica, I've been with nine other older women over the last four years. There was the divorced friend of a former tutor, two doctors I met in the US while on a university exchange programme, a corporate high-flier - these are just a few. All of them were more than eight years older than me.

My wildest encounter was with the doctors in the US. I met two of them on a night out and ended up sleeping with both the same night. I didn't even make the first move - they propositioned me 20 minutes after we met.

Among all these women, Jessica was the exception - we were a couple in everything but name.

With the other women, it was mostly physical. Some were one-night stands, and almost all the women made the first move.

We do elicit strange stares when we're out, but most of the time, these women prefer to keep things on the down-low - so many hours are spent in bedrooms, back seats and quiet, nondescript bars.

I've told some close friends about the cougars, but they've only met one of them ­- a corporate high-flier named Rebecca*, who showed up at a club where I was partying with friends and bought everyone a round of drinks. My friends, who used to taunt me about my secret relationships, were left with their mouths agape.

The women I've been with are usually successful, confident and in control of their career and finances. But they often have had no time for love, and some had recently ended relationships when we met. They wanted someone who'd listen to them. And they also wanted no-questions-asked sex.

I'm not sure what it is about me that pulls them. Perhaps it's because I'm not shy about letting these women know that I'm checking them out even if they're older. I think women can tell when you're not intimidated by their success. The simplest explanation I can offer: these women seek a non-judgmental guy willing to show them a good time without any strings attached.

I just happen to be that guy.

Over the years, though, I've laid out some ground rules. No boyfriend or a husband in the mix, nor a girlfriend on my end. More importantly, I always make it clear that I'm not seeking a relationship and most of them have been more than happy with this arrangement.