No. If anything that is an idiom. A simile is a comparison of two things using words like "like" or "as". An example of a simile is "Her eyes are as blue as the sky".
Your scrotum will hang lower as it grows to accomodate the increasing size of your testes. The skin of your scrotuum will get deeper in colour, the surface will probably get covered in small bumps...
Usually no. This can be any number of things, and the first that comes to mind is that there was no pregnancy and that this is a period, and the second is that it could be a miscarriage. However,...