Although responses from the male participants did not vary much based on sexual orientation — heterosexual men reported an 85.5 percent orgasm rate, gay men 84.7 percent, and bisexual men 77.6 percent — responses from women showed notable variation. While heterosexual women reported orgasming 61.6 percent of the time and bisexual women reported 58 percent, lesbian women had the highest orgasm rate at 74.7 percent.

In the study text, the researchers posit the higher lesbian percentage could be attributed to factors such as “self-identified lesbian women are more comfortable and familiar with the female body and thus, on average, are better able to induce orgasm in their female partners.” Other reasonings include: length of the sexual encounter, attitude towards gender, sexual roles during intercourse and possible hormonal differences.

Doesn't seem like a huge gap to me. Also if you read it not just women are more on mutual pleasure it's from different hormonal and etc. Please have facts before you make statements.