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《Mom No Teach I Teach》EP1:
Why semen drips instead of shooting out?

18 Mar 2022
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成日都話射精射精,到底精係咪一定射出學呢?

射精,顧名思義,很多情況下是射出來的。但如果你周廣見聞的話,有很多人不是射出來,反而是流出來,必出來,或者滴出來。

首先,我地要了解下射精是用什麼肌肉?

射精係由陰莖上的球海綿體肌肉有節奏的收縮而成的。即是它是主力負責將精液泵出身體!

射精時,一開始會十分有規律,以每0.8秒收縮一次。大概三至四下收縮後,就會變得無規律和力量減低。射精後段的不規律也來自JJ肌肉的不規則、輕微收縮。平均來說,精液頭三波可以射到30-60cm,之後會好快減弱。年過50的人會射得沒那麼遠,。

精液射出的「射程」,而這個壓力要考慮容量,即係有幾多精液,佢經過嘅空間大細,同埋有幾多推進力吱佢出來。會影響呢個壓力的因素包括:

1. 精液量
每次射精,精液的容量介乎2-5毫升。低精液量自然降低壓力,令精液無辦法噴射。

2. 尿道
尿道如果比較闊,或者比較長,都會令體內的壓力無辦法將精液推得很遠。尿道口的構造也有一點影響,有機會令精液不是一條水柱射出,而比較像是花灑頭般分幾道射出,擴散得多,射程就會短一點。

3. 膀胱括約肌
一般射精時,膀胱連接尿道的括約肌會收緊,以免精液倒灌進膀胱。不過有些人的括約肌收縮不足,有機會令精液反方向射入膀胱。這情況對膀胱本身是無害的,不過會影響射出身體的精液量。

4. 年紀
有研究發現年長的人,製造與射出精液的過程沒有年輕人分野得那麼清楚,可以理解成一路整、一路射,所以往往是流出來。也有研究指,年長男性如果㪍起時間比較長,流出來的機會也比較高。所以年長的人比較容易流出來多過射出來!

聽左咁耐我地可以得出一個總結就係射精其實真係改壞名,因為射真係唔一定射出黎~就算係呢一刻係射就黎,過幾年就可能流出黎~射精就好像射波咁樣,唔一定猛虎射球先精彩,有時候滴滴仔咁入龍,都有佢嘅韻味的~

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While we envision semen to be shot out in jets, does ejaculation have to be ejected?

In many cases, it is indeed ejected. But if you're seen a few for yourself, you'd know that a lot of people don't come in jets. Rather, their semen seep out, squeeze out, or even drip.

First, we need to know what muscles help with ejaculation. Ejaculation is controlled by rhythmic contraction of bulbocavernosus muscle in the penis. It acts as the pump that pushes semen out of the body!

Ejaculation starts with steady contractions spaced about 0.8 seconds in between. After 3 to 4 cycles, the contractions become weaker and more irregular. This irregularity is also affected by the penis’s own contraction. On average, the first 3 pumps of semen can shoot out in a 30 to 60 cm range, weakening quickly. People after 50 have a shorter range of 15 to 30 cm.

The trajectory of ejaculation depends on the pressure produced in the body, which factors in volume (i.e. how much semen there is), the amount of space semen passes through, and the power of propulsion. Here are some of the factors.

1. Volume of semen
Each ejaculation expels around 2 to 5 ml of semen. Smaller volumes of semen will lower the pressure and cause it to not shoot out.

2. Structure of the urethra
If the urethra is on the wider or longer side, the pressure build-up would be insufficient to push semen far away. The opening of the urethra has a bit of effect as well, in the sense that it might cause semen to not be expelled in jets, but rather like sprays. Wider dispersion could shorten its range.

3. Urethral sphincter
Normally, the urethral sphincter between the urinary bladder and the urethra contracts, preventing semen from flowing back into the bladder. But for some, the sphincter is not tightly closed, causing some semen to backflow. This is harmless to bladder health, but would affect the amount of semen expelled out of the body.

4. Age
Studies indicated that in older people, the emission and expulsion phases of ejaculation is not as distinct compared to younger individuals. One could understand it as semen making and ejecting happening simultaneously, which causes semen to seep rather than shoot. Studies also found that the longer an erection is maintained in an older male, the higher the chance that semen is seeped out. Therefore we could conclude that older people are more likely to experience a flow of semen!

The idea to take home is that ejaculation doesn't have to be ejected~ Even if it comes in jets now, you might experience it in slower flow later on. Ejaculation is like shooting for the goal - you don’t always have to shoot hard. A ball slowly rolling in can also make the goal!



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