James Hemming pleaded guilty to wounding with intent after a 17-year-old girl was badly injured in Fratton.
Subway Sex Assault CCTV
Detectives investigating a sexual assault in Bournemouth have released CCTV of a man they would like to speak too.
A 20-year-old woman was attacked in the subway under St Paul's roundabout in Springbourne at around 1.30am on Friday 1 February.
She was unexpectedly grabbed from behind by an unknown man, but luckily escaped without any serious injuries.
Detective Inspector Becky Riggs, of Bournemouth CID, said: "This unprovoked attack has left the victim very shaken and frightened.
"Following further enquiries, I am now able to release two CCTV images of a man we believe could help us with our investigation.
"I would urge the man pictured -and anyone who recognises him - to contact me, in confidence, as soon as possible."
No arrests have been made.
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 01:20. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone
tariffs may apply.
Dorset and Hampshire officers will be carrying out extra patrols until New Year's Day.
Hampshire Police have dealt with more than 100 cases in a year of people being blackmailed over intimate webcam images.
£600 was stolen after workers at Coral on Columbia Road were threatened with an axe.
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