How many liters of semen are produced weekly?

There is no exact answer to this question, but assumptions can be made based on research that allow a reasonable estimate to be made.

How many men of reproductive age live in the US?
About 137,000,00 men, age 15-90 (https://globalpopulations.com/us/)

How man times do men in the US have an ejaculation?
Approximately two times a week, depending on age, this is on average (https://pmc.ncbi.nlm.nih.gov/articles/PMC9794105/ and https://pubmed.ncbi.nlm.nih.gov/21029386/

What is the volume of 1 ejaculate?
Between 1.25 and 5.00 ml of semen each ejaculate. Let’s choose the average of 3 ml.
https://www.issm.info/sexual-health-qa/what-factors-determine-semen-volume/

This is each week 137,000,000 men 2 times 3 ml, makes 822,000 liter. For convenience, let’s round it up to 800,000.

Can sperm survive in water?

Sperm has impressive survival mechanisms that allow for extended survival under various conditions, according to https://sperm.blog/sperm-in-toilet-exploring-the-facts-and-common-misconceptions/.
Also, fertile sperm does not sink in water. Sperm is a lightweight liquid that cannot overcome the density of water. Instead, it tends to float and move with the flow (https://sperm.blog/does-fertile-sperm-sink-in-water-find-out-the-truth/). So, semen is not typically impacted by water in the short term, which is to say that sperm will generally survive (https://spiegato.com/en/what-happens-to-semen-in-water).

Watch this video to learn what really happens to sperm in water:
https://www.youtube.com/watch?v=XpFuwoz5yK8

Is taking an SSRI daily effective against getting an ejaculation?

Selective serotonin re‐uptake inhibitors (SSRIs), which are used mostly to treat depression, can help men who ejaculate faster than they want, to slow down. However it doesn’t lead to anejaculation, although it sometimes does, SSRI treatment appears to substantially improve perceived control over ejaculation when compared to placebo. Undesirable effects are a small increase in treatment withdrawals due to adverse events as well as substantially increased adverse event rates. The advantage is preferable to the disadvantage (https://pmc.ncbi.nlm.nih.gov/articles/PMC8094926/).

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