How many "years"? Because I've been searching, and the only incident I've seen from her book was the one I referred to earlier, when she was seven. I'm not "defending" her, I'm saying that at seven (or six, or eight), it is not "abuse," and does not even begin to compare to what Duggar did at 14 (which, as I noted above, is miles apart in terms of development, hormones, etc.)
In her newly published collection of personal essays, Not That Kind of Girl, Lena Dunham describes experimenting sexually with her younger sister Grace, whom she says she attempted to persuade to kiss her using “anything a sexual predator might do.” In one particularly unsettling passage, Dunham experimented with her six-year younger sister’s vagina. “This was within the spectrum of things I did,” she writes.
In the collection of nonfiction personal accounts, Dunham describes using her little sister at times essentially as a sexual outlet, bribing her to kiss her for prolonged periods and even masturbating while she is in the bed beside her.
I found this on a site called truthrevolt.org. I did not read her book. From this description, I don’t care what age she was, she was abusing her baby sister. Defend it all you want but in my opinion, it was abuse.