For any behaviour to be defined as addictive, there have to be specific consequences such as it becoming the most important activity in the person's life or being the way they improve their mood.

BBC: Why anything can be addictive

The most important part of such a person's treatment would be to understand what would lead him to want to put himself a potentially self-sabotaging situation, he said.

CNN: What would help for Weiner look like?

"The single most important thing we can do for any young person is give them the self-confidence to be able to make good decisions for themselves, " he added.

BBC: Nadine Dorries: Schools should teach sexual abstinence