"Metrosexuals - they certainly are conscious of it and certainly do want to be quite well groomed in that respect,'' she said.
However, men in their 50s also had their backs waxed.
"They're quite conscious [of hair] and they just feel better after it.''
Some men liked to have hair removed because they did not like feeling self-conscious in their togs, Ms Shannon said.
It's a bit like women with hairy legs - some men just didn't like having hairy backs or hairy chests, she said.
The Wellington beauty therapist, who has been working in the industry for 27 years, said only women visited salons when she first began.
"It's been a very gradual [increase], but definitely the younger guys prefer to be more hair-free.''
Between six and eight men visited the salon each week for treatments. While leg- and back-waxing were the most common treatment for men, facials were becoming more popular, she said.
The research was presented at the British Psychological Society's Psychology of Women annual conference in Windsor, near London, today (11/07).