Yes, female ejaculate contains protein. The most well-studied proteins in the fluid are prostate-specific antigen (PSA) and prostatic acid phosphatase, both of which are also found in male seminal fluid. These proteins are produced by the Skene’s glands, small structures located on the front wall of the vagina that are considered the biological equivalent of the male prostate.
What’s Actually in Female Ejaculate
When researchers have analyzed female ejaculate and compared it to pre-coital urine from the same women, the two fluids look quite different. The ejaculate has lower levels of creatinine (a waste product associated with urine) but elevated levels of PSA, prostatic acid phosphatase, and glucose. PSA concentrations in female ejaculate can exceed 30 ng/ml, which is notable given that PSA is one of the key protein markers in male seminal fluid as well.
These proteins aren’t just present in trace amounts. PSA in particular plays a functional role. Research published in ScienceDirect suggests that PSA in female ejaculate may enhance sperm motility by helping dissolve seminal coagulum, the gel-like consistency of semen after ejaculation. This would, in theory, free sperm to move more effectively toward an egg.
Where the Protein Comes From
The Skene’s glands (also called paraurethral glands) are the source. These small glands sit alongside the urethra and drain into its lower end through tiny ducts. They contain prostate-like tissue that produces PSA and other secretions. Not all women have Skene’s glands of the same size or activity level, which likely explains why some women produce noticeable ejaculate and others don’t.
The fluid itself is typically described as thicker and whitish compared to the more watery fluid associated with squirting. This distinction matters for understanding the protein content, because the two fluids have different compositions.
Ejaculation and Squirting Are Different Fluids
One of the biggest sources of confusion around this topic is that “female ejaculation” and “squirting” are often used interchangeably, but biochemically they appear to be two separate events. A key study distinguished them by analyzing fluids from the same woman during the same session. The thicker, smaller-volume fluid (ejaculate) contained protein markers comparable to components of male semen. The larger-volume, clear fluid (squirting) had biochemical markers closer to dilute urine, containing urea, creatinine, and uric acid, with only marginal PSA levels.
A 2015 study of seven women confirmed this distinction. Ultrasound scans showed that participants’ bladders filled rapidly during arousal and emptied during squirting, suggesting that the high-volume fluid originates largely from the bladder. The ejaculate, by contrast, comes from the Skene’s glands and carries the protein-rich profile. In practice, many women release a mix of both fluids simultaneously, which is why lab results can vary so much from person to person and study to study.
How Much Protein Compared to Male Semen
Female ejaculate contains some of the same protein markers as male semen, but the overall volume and total protein load are smaller. Male semen typically contains dozens of proteins in concentrations designed to nourish and transport sperm. Female ejaculate shares specific markers like PSA and prostatic acid phosphatase but lacks sperm and the full complement of seminal proteins.
Researchers have also looked for fructose, a sugar found in male seminal fluid that serves as an energy source for sperm. Some scientists have pointed out that fructose could be an important marker for distinguishing true ejaculate from urine, but not all studies have controlled for it, leaving this question partially open. Glucose, however, has been detected at elevated levels in female ejaculate.
Why Research Is Still Limited
The science on this topic is built on small sample sizes. The landmark study that proposed separating ejaculation from squirting involved a single participant. The follow-up confirming squirting’s urine-like composition involved seven. A 2024 Swedish cross-sectional study noted that a “semantic shift” in how researchers talk about these fluids was based largely on that one initial case, and that much remains unconfirmed at larger scale.
Part of the difficulty is practical. Collecting fluid samples during sexual arousal in a controlled lab setting is logistically challenging, and recruitment for these studies is understandably difficult. What the existing research does establish clearly is that female ejaculate is not urine, that it contains measurable proteins produced by prostate-like tissue, and that PSA is the most consistently identified protein in the fluid.