Rebecca, 30, is a radiographer and has been in a relationship with David, 49, for four years.

Four years ago, I was waiting for a cab, when a cute man politely suggested I get in with him. And the rest, as they say, is history. I fell in love with David on the first day, we moved in together four months later, and within a year of meeting, we were engaged.

A few weeks after he proposed, things changed. He wasn't spending as much time at home and his sex drive had disappeared totally. Our sex life had been great, so I was quick to notice that something wasn't right. It was bizarre. There was something going on, I just knew it.

When I asked, he'd say he was really busy and stressed in his job as a trader, and that he had a lot on his mind. I believed him.

A few weeks later, he texted me saying he'd popped home at lunch, but had been called back into the office. Later that day, I went home and settled down to have a bath, but noticed the towel hanging on the back of the door was covered in makeup that wasn't mine. I always took my makeup off before washing.

I confronted David, even though I trusted him. He denied having done anything and said he'd never bring another woman into our home, so I tried to forget about it, thinking I was being paranoid.

The reason I was so hurt was that David had been getting his kicks without me.

Two days later, I was up early and making tea for us when I found a used condom in the kitchen bin. It was just sitting there, right on top of the rubbish. We didn't use condoms or have them in the house.

I tried to keep calm but wanted to scream inside. I grabbed the bloody thing and put it on the tray with his mug of tea and took it up to him in bed. David looked at it and asked, "What is this?" I just said, "Are you f--king kidding me?"

At first, he said his ex must have broken into the house and planted the condom. But the truth came out when I said I was leaving him. David finally admitted he'd brought a sex worker back to our home on his lunch break and slept with her in our bed.

It was such a big shock. I thought I'd found my Prince Charming and that everything was perfect. Leaving him, I went to stay with a friend but only lasted about a week. I loved him so much, I knew I would end up going back to him.

An escort comes, gets paid and then leaves. There's no emotional attachment.

The reason I was so hurt was that David had been getting his kicks without me being present … it almost felt as if he didn't need me and that I didn't satisfy him sexually. So, after thinking things over, I came up with a solution. "I'm willing to be a part of this, as long as you don't do anything behind my back. We can do it together," I suggested to him.

Not everyone can understand it, and I know it's kind of weird but it's okay with me because it's just sex. An escort comes, gets paid and then leaves. There's no emotional attachment – it's like having a party with a girlfriend who you'll never see again … kind of.

Now we invite an escort to our house once or twice a month, and always choose the girl together. We'll play in the bedroom for maybe an hour or two, and then she'll leave. Afterwards we watch TV at home with popcorn and takeaway like any normal couple.

Usually, we go for girls who look similar to me. The women we hire are very high-class escorts and usually models. Most of them are very intelligent as well, and some are studying to be doctors.

The three of us will talk a little bit before we actually do something, and we'll have a drink and some food. Sometimes we have sex all together and sometimes we take turns. There have been times where we've had sex in front of the escort and she's just watched us. David often doesn't do anything with her and will just watch me – he's more focused on my satisfaction now and loves seeing my pleasure.

It did feel strange at first, but now I really enjoy it. If anything, it makes me excited to see him with someone else. Plus, being with other women has helped me find out I'm bisexual. I like the company of a woman, not for a relationship, just for sex.

Prices vary, but we see a regular girl who charges $1,300 per hour. Others charge between @400 and £700, but I prefer to pay a little bit more if she's nice and educated. It's not just about looks, when you have sex, the mind is important too.

Our arrangement has definitely made our sex life better. We like to think about it, and talk to each other about the previous experiences. It makes us really excited. Although we have a few swinger friends who do the same kind of thing and we're on a forum, we don't really tell anyone about it. People can be very judgmental.

The pact David and I have might seem unusual to other couples, but it really has improved our relationship. Before, I was quite frightened of experimenting, but this has taught me there's nothing wrong with it. After we've been with a girl, I don't really think about it. It really is just a bit of fun.

From: Esquire US