Many men take up gardening when they retire, they might even revel in the odd spot of golf on a summer's day or start taking the grandkids on trips out to the seaside.
But not Clive, oh no. He's a 62-year-old former maths teacher who has fathered 65 children and aims to reach 100. And the craziest bit? He does his business in the back of his van. And by business we're talking about his sperm distribution.
The granddad has revealed his identity in a new documentary filmed by Channel 4 called Super Sperm Donors. He allowed the crew to film him travel around the country in his van.
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Clive, who has three children with his wife and nine grandchildren, refuses payment for his service because taking a fee would be illegal.
He will happily give up an entire day to drive from his family home in Burton, Staffs, to wherever the recipient lives.
Once there, he parks in a nearby street, climbs in the back of the van and fills a syringe before handing over the 'donation', which he keeps warm under his arm.
Speaking to The Sun, well-spoken Clive, who does not want to give his surname, says: "I give them the syringe and will talk to them for about five to ten seconds, just make a bit of idle chit-chat.
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"They are often nervous and it's just a way of putting them at ease.
"I know this is probably unusual but for me, by doing it in the van there is far less involvement, less emotional attachment."
As he's not offering his sperm using a Government-approved Human Fertilisation and Embryology Authority-licensed clinic, he could be deemed the legal parent.
He hopes using the van will help lower the chances of people thinking he's anything more than a donor.
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Clive adds: "I also know, technically, if any of the ladies ever wanted to report me to the Child Support Agency in the future, they could nail me for 18 years for child payments."
Just imagine if he gets to 100 and they all come for him.
He insists the sole reason he provides the service is to help others. But it's clear he gets a kick out of populating the planet.
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He says: "I love the joy it brings. So many people say, 'Thank you so much, Clive, you really have changed our lives'.
"That, for me, is why I do it. It's special. I wanted to help their plight because I love children so much."
"About two thirds of the people I have helped are same-sex couples. The others are heterosexual couples and a few are single ladies. I am not strict and I do believe every lady deserves to have a baby.
"All I am doing is helping. I have always insisted on artificial insemination. I know some donors advertise this but it turns out they want sex.
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"I have had several people turn around to me and say, 'Crikey, Clive, it is so nice to meet a normal person'."
On average the granddad makes 16 donations a month but only a couple tend to lead to a pregnancy.
Clive says: "I get down when nothing happens. One month I can have no results and the next I can have four pregnancies.
"But I know clinics offer only a one-in-eight chance - as well as charging around £6,000 - so I have to keep reminding myself of this."
If a donation from Clive does fail, he will return weeks later with another.
He admits: "When I first set out I did wonder if I would feel anything. You never know how the emotional side is going to play out.
"You wonder if you will start to think that they are your children and will you want access. But I have never had any of these feelings."
He admits that he does see 'five or six' of the children he has helped bring into the world.
He added: "I've got a lot of friends on Facebook and I can see photos on there. They usually send a photo and update every year too.
"Three weeks ago I called to a place outside Liverpool to see two of the children. One was the very first success I had five years ago. I pop by every six months or so.
One person who doesn't like what Clive gets up to is his wife who has been less enthusiastic.
He said: "She knows about it but she doesn't like it. Initially I didn't tell her and there were a few white lies about where I was going.
"A few months in, I decided to bring up the subject. I thought she was going to like it, so over a meal I talked about becoming a sperm donor.
"By her reaction you could see she was not impressed, so I dropped it."
Each to their own we say. The world would be a boring old place if everyone was the same.
Featured Image Credit: Channel 4Topics: Interesting, Documentary, Community, Channel 4