It claims the Girls creator describes using her sister to sexually experiment with, writing that she attempted to persuade her to kiss her using the sort of methods "a sexual predator might do".
Dunham posted a series of angry tweets addressing the allegations made in the article.
"The right wing news story that I molested my little sister isn't just LOL- it's really f**king upsetting and disgusting.
"And by the way, if you were a little kid and never looked at another little kid's vagina, well, congrats to you.
"Usually this is stuff I can ignore but don't demean sufferers, don't twist my words, back the f*** up bros.
"I told a story about being a weird 7 year old. I bet you have some too, old men, that I'd rather not hear. And yes, this is a rage spiral. (sic)"
A representative for Dunham has yet to confirm whether the author has plans to cancel any more dates on the European leg of her tour.
- Independent