She describes her live chats as being “like serious lectures”, and insists many men like her approach because they admire smart women.

Being a PTGF has helped Celine to better understand the way men think and behave, she says.

While other PTBFs highlight their strengths on their self-introduction on Instagram, I emphasise that I’m not a good PTBF.

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“Some people just ask directly, but I guide them to think differently, to consider whether they really do desire me sexually,” she says. You can have fun with her, but not other girls’.” She suggested he take his wife on a trip because having an affair was not a solution to his problems.

She recalls how one customer, bored in his marriage, asked her to be his mistress. A talkative woman, Celine enjoys spending time chatting with clients, many of them well-off professionals, who are looking for a dinner companion or meaningful conversation. To the younger ones, she is like “a big sister” they can look up to.

It’s also given her a clearer idea of the kind of man she is ultimately looking for.

She says it will help her to better understand a future boyfriend or husband.

There is one customer who always comes back, though, once or twice a week.

They message each other constantly on a daily basis – at the girl’s initiative.

Although she has met a man with a taste for sado-masochism, who paid her HK,000 to “beat” him, she insists there was no sex involved. Her clients usually take her to the cinema or meet up for a chat, Jo says.

She states clearly on her Instagram account that anything sexual is completely off the menu.

Jo meets clients, aged between 25 and 35, about twice a week at nighttime and during weekends, when she’s not studying.

The phenomenon of part-time girlfriends – or PTGFs – for rent in Hong Kong has blossomed on social media in recent months.

Spending time with customers does not give her the feeling of being in a relationship, she says. We don’t talk about materialistic things or money when we are in love.” One client asked her to be his girlfriend, but she told him straight that a PTGF is merely a commodity and any relationship is ephemeral.