Athenan

The Athenans were an all-female species distantly related to the Vulcans and Romulans, seperated evolution-wise by over a thousand years. First contact with the Athenans was made by the Federation sometime prior to the year 2409. (Star Trek: Helen)

Early History
According to historical records, the first Athenans where among those that Marched Under Raptor's Wings, at some point however they parted ways with the rest of those that had left Vulcan and settled down on a Class-M planet that would come to be known as Athena. The first Athenan government was Matriarchal, but treated males quite well, which would last awhile, despite several attempts at reform.

The Athenan Plague
Around 1988, the Athenans where hit by a plague of unknown origin that seemed to target only the Athenan males. All attempts to cure the disease failed, and the end result was that the Athenan males where wiped out. Out of desperation, the Athenans set out into the stars in order to seek out mates, usually through seduction or enslavement, out of this desperation, the Athenans managed to survive.

Soon, it was discovered that the virus hadn't been without its side-effects on females, leaving them incapable of bearing sons. It was a popular Athenan conspiricy theory that it wasn't a naturally occuring plague, but was created by the government.

First Contact with the Federation
An Athenan named Misara had stowed away on the USS Galahad, she approached the captain, and using the typical Athenan charms seduced him. The Athenans made the appeal to join the Federation, and where permitted entry if they stopped kidnapping males for reproduction.

Selva was the first Athenan to enter Starfleet Academy.

Culture
The Athenans, despite their nature to seduce men, are typically a peaceful species, having only some minor wars early in their history. They run a represenative democratic system, even before their entry into the Federation, and live in relative luxury. Athenans tend to put more focus on females than males, a hold-over from their matriarchal society, but they will treat men with respect.