Precum is a clear, colorless, slippery fluid that appears as a small drop or thin streak at the tip of the penis during sexual arousal. It typically has a watery to slightly viscous consistency, thinner than semen and without the white or cloudy appearance that ejaculate has. Most people produce one to two drops, though the amount varies widely from person to person.
Appearance and Texture
Precum looks similar to a drop of clear, slightly sticky liquid. Think of the consistency of a raw egg white, but thinner and less stretchy. It has no color, or at most a very faint translucence. Unlike semen, which is thick, white, and opaque, precum is almost entirely transparent. It doesn’t have a strong smell, and most people describe it as essentially odorless or very mildly salty.
If you notice that the fluid at the tip of your penis is yellow, green, cloudy, thick, or has an unusual smell, that’s not typical precum. Discolored or foul-smelling discharge can signal an infection such as chlamydia, gonorrhea, or a urinary tract issue, and it often appears even when you’re not sexually aroused.
When It Appears
Precum shows up early in arousal, often before a full erection has developed. The Cleveland Clinic places its release during the very first phase of the sexual response cycle, alongside initial physical signs like testicular swelling and scrotal tightening. It can appear during foreplay, while watching or thinking about something sexually stimulating, or during any form of physical arousal. Some people notice it consistently, while others rarely see it at all. Both are normal.
Where It Comes From
Precum is produced by two pea-sized glands located just below the prostate, on either side of the urethra. These glands release the fluid directly into the urethra in response to arousal. The fluid serves two purposes: it lubricates the urethra to make ejaculation smoother, and it neutralizes leftover acidity from urine. The urethra is the same tube used for both urination and ejaculation, so this neutralizing step helps protect sperm that will pass through the same channel moments later.
Can It Contain Sperm?
Precum itself is not produced in the same glands that make sperm. However, sperm from a previous ejaculation can linger in the urethra, and precum can pick those sperm up as it passes through. This is why the withdrawal method (pulling out before ejaculation) is not a reliable form of birth control. Studies have found live sperm in the pre-ejaculate samples of some men, though not all. Urinating between ejaculations may help flush residual sperm from the urethra, but this isn’t a guarantee.
STI Risk From Precum
Precum can carry sexually transmitted infections. HIV, for example, is present in pre-ejaculate fluid, which means transmission is possible even if the insertive partner withdraws before finishing. The same applies to other STIs that spread through genital fluids. This is one of the reasons barrier methods like condoms are effective: they contain precum from the moment of penetration, not just at ejaculation.
Normal Variations in Amount
The volume of precum varies dramatically between individuals. Some people consistently produce enough that it visibly wets their underwear during arousal. Others produce so little they never notice it. Neither extreme indicates a health problem. Age, hydration, and level of arousal can all influence how much appears at any given time. There’s no “correct” amount, and producing very little or quite a lot are both within the normal range.
If you’re noticing a sudden change in the amount, color, or consistency of fluid from your penis, especially if it happens outside of arousal or comes with burning, itching, or pain, that’s worth paying attention to. Discharge that shows up on its own, unrelated to sexual arousal, is a different phenomenon from precum and may point to an infection or inflammation.