Their work included women and men, and, unlike Alfred Kinsey in 1948 and 1953, tried to determine the physiological stages before and after orgasm. Masters and Johnson argued that, in the first stage, "accessory organs contract and the male can feel the ejaculation coming; two to three seconds later the ejaculation occurs, which the man cannot constrain, delay, or in any way control" and that, in the second stage, "the male feels pleasurable contractions during ejaculation, reporting greater pleasure tied to a greater volume of ejaculate". They reported that, unlike females, "for the man the resolution phase includes a superimposed refractory period" and added that "many males below the age of 30, but relatively few thereafter, have the ability to ejaculate frequently and are subject to only very short refractory periods during the resolution phase". Masters and Johnson equated male orgasm and ejaculation and maintained the necessity for a refractory period between orgasms. Subsequent and multiple orgasms
There has been little scientific study of multiple orgasm in men. Dunn and Trost defined male multiple orgasm as "two or more orgasms with or without ejaculation and without, or with only very limited, de-tumescence (loss of erection) during one and the same sexual encounter". Although, due to the refractory period, it is rare for men to achieve multiple orgasms, some men have reported having multiple, consecutive orgasms, particularly without ejaculation. There may not be an obvious refractory period, and the final orgasm may cause a refractory period.
This is the same speed the water (or anything else) would have if freely falling the same vertical distance h.

Kinematic pressure
P
        =
        p
        
          /
        
        
          ρ
          
            0
          
        
      
    
    {\displaystyle P=p/\rho _{0}}
  is the kinematic pressure, where 
  
    
      
        p
      
    
    {\displaystyle p}
   is the pressure and 
  
    
      
        
          ρ
          
            0
          
        
      
    
    {\displaystyle \rho _{0}}
   constant mass density.