MB Semen vs WD Semen

[Texanguy]

There is more than one study that shows that semen volume from MB is lower than from coitus (sex), and that it has a lower percentage of viable sperm cells in it. In other words, scientific investigations show that both semen volume and sperm cell concentration are lower from MB than from sex. (link and quotes below)

Study details
The study was looking at sperm quality for guys having trouble getting their wives pregnant -- but they had a comparison group of normal guys.
We'll focus on the 'normal guys' here.

Additional Assumption
This study did not investigate WD semen. But since guys who have WDs often say that their semen volume from WDs is larger than from MB, their orgasms are more intense, and that the best WDs can feel as good as the best sex, we can conclude that WD semen is more like sex semen in volume and potency than it is like MB semen.

Some key quotes from the article about the lower quality and volume of MB semen
"The question arises as to what is responsible for the marked
increase of the quality of an ejaculate produced during coitus
compared to a sample produced during masturbation, if it is
not the higher level of sexual arousal."

"In conclusion, we have found no evidence to suggest
that the variability of an individual's semen characteristics,
produced by masturbation, is in any way altered by the level
of sexual arousal. It remains an enigma how an individual's
inter-ejaculate disparity can be explained"

In other words, they found that while things such as visual stimulation and higher arousal resulted in reaching MB orgasm easier, it did not change the reduced semen volume and lower sperm count from MB. They can't explain the difference, they can just measure it.

Description from the article of the detailed differences in semen quality for the normal group between MB and coitus samples from the same guys
"In normozoospermic (normal) individuals:
--semen volume (sex compared to MB) increased by 19-25%,
--total spermatozoa per ejaculate increased by 49-56%,
--progressive motility increased by 8-10%, and
--normal morphology by 4-5%"

This study also quotes other studies, so this appears to be a pattern.

It looks like it's a simple fact that ejaculate from MB is simply smaller and of lower quality than from sex. We can conclude for our purposes that WDs generally produce semen volume and quality more similar to that from sex than from MB.

Conclusions/projections based on their data
--They don't have an explanation for this lower semen volume and quality from MB, but it would seem that the brain/body knows the difference, and basically cuts short the orgasm/ejaculation in MB early.
-- The MB letdown appears to begin before the ejaculation is complete, reducing the volume ejaculated, reducing the amount of sperm cells injected into the semen, and causing the loss of horniness afterwards.

Horniness differences
Sex and WDs can leave a guy horny immediately after, whereas the smaller and lower quality ejaculate from MB is correlated with post-MB letdowns and loss of horniness. This is the opposite of what a lot of MBers might expect.

Link to the article
It is rather academic, and some of their data is useful for this topic
Here's the link. Once inside the link, you have to click on 'PDF' to see the full article.
https://academic.oup.com/humrep/article ... ogin=false