Low libido despite normal testosterone — why?

Semen appearance varies considerably and normally, both between men and between ejaculations for the same man. Normal semen is typically whitish-grey or slightly opalescent, and it liquefies from a gel-like state within about 15 to 30 minutes. Colour and consistency change with abstinence period, hydration and frequency. What is worth attention: persistently yellow or green semen may suggest infection; pink, red or brown indicates blood; and semen that remains thick and fails to liquefy can affect sperm movement and warrants assessment. What is generally not concerning: a slightly yellow tinge after a longer gap, variation in volume between occasions, or a temporary change that resolves. Volume itself is a poor guide to fertility. Semen volume and sperm count are separate things, and neither can be judged by looking. If a change persists beyond a few weeks, or comes with pain, burning, fever or discharge, see a urologist or sexual health clinic. Otherwise, a semen analysis is the only way to assess quality — appearance tells you very little.