The phrase "only female" means that there is just one woman or girl among a group of people, animals, or objects. It emphasizes that she is the sole female in that particular group. Full definition
Only females in lower positions with little hope of promotion were not judged negatively in suggestive attire. (remonline.com)
For some reason, at this point, «safe mode» is only available for male users and only female members are asked to become verified. (datingsitesreviews.com)
It's not only female involvement in front of the camera that concerns me, but behind the camera as well. (themarysue.com)