a lot of men are indulging in the act of blocking semen from coming out by holding and pressing tight the end of penis during ejaculation. the reasons are endless one of which is withdrawal methods, or techniques to stay longer after that another round, another reason is when someone don't want to waste the semen so they want to take it inside back. let take a look at this sex education.

Orgasm

When a male is about to have an
orgasm, his penis is stiff and erect, the skin on
his scrotum gets tighter and his scrotum draws
up close to his body.

His heart beats harder and his breathing gets
deeper and heavier. Some of his skin may flush,
his nipples may change color or get hard, and the
muscles around his anus may tighten up. The
whole orgasm lasts about ten seconds.


When a male ejaculates, his muscles contract and
sperm and semen mix and are pushed into the
urethra and come spurting out of the opening in
the glans – or tip – of the penis. The semen
usually comes out in three or four spurts. In all,
about a teaspoon of white, creamy, milky semen
comes out of the penis.

Stopping the ejaculation, by covering the end of
the penis with a finger or thumb, can cause
"retrograde ejaculation," which means the semen
travels back up the urethra and can be forced up
the tube that leads to the bladder, or forced into
the prostate gland.


Retrograde

Retrograde ejaculation occurs when semen ,
which would, in most cases, be ejaculated via
the urethra, is redirected to the urinary
bladder . Normally, the sphincter of the bladder
contracts before ejaculation forcing the semen
to exit via the urethra, the path of least
resistance. When the bladder sphincter does
not function properly, retrograde ejaculation
may occur. It can also be induced deliberately
by a male as a primitive form of male birth
control (known as coitus saxonicus ) or as
part of certain alternative medicine practices.


Signs and symptoms

Retrograde ejaculation is sometimes referred
to as a " dry orgasm ." Retrograde ejaculation is
one cause of male infertility . Men often
notice during masturbation that they do not
have semen release but there is an orgasm.
Another underlying cause for this phenomenon
may be ejaculatory duct obstruction .

During a male orgasm, sperm are released
from the epididymis and travel via small tubes
called the vas deferens. The sperm mix with
seminal fluid in the seminal vesicles, prostate
fluid from the prostate gland, and lubricants
from the bulbourethral gland . During climax,
muscles at the end of the bladder neck tighten
to prevent retrograde flow of semen. In
retrograde ejaculation, these bladder neck
muscles are either very weak or the nerves
controlling the muscles have become
damaged.

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