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Why I love Physics

Pre ejaculatory fluid and vaginal fluid viscosity affect for ease of back and forth movement of penis inside vagina.eg. man penitrate women in missionary position(lies on top of the woman) similar to an object is moving upwards and downward on inclined plane.

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Calculate force needed to move upwards an object (similar to dimensions and weight of the penis) with and without lubricant(similar to viscosity of pre ejaculatory fluid and vaginal fluid).

Consider plane inclined 35 degrees(at this position vagina inclined about 35 degrees).You need lubricant thickness on inclined plane and viscosity of lubricant at this question.Understand importance of sexual fluids for vaginal sex(for ease of penetrate a woman)
 
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