They measured levels of desire through a journal - based evaluation in which subjects recorded their levels of sexual drive on a daily basis. (sciencemag.org)
Male cats that are not neutered have a high sexual drive, and in order for that drive to be met, they want to find female cats. (cattime.com)
Do you ever suffer from a lack of confidence or a lowering sexual drive, then again, it's an observation that you may be responding to a low level of testosterone. (turbobulk.com)