The Eunuch calm, with reduced or eliminated thoughts of sex and aggression
Reduced libido, sometimes resulting in total asexuality.
Weight gain, including subcutaneous body fat. The skin becomes softer and smoother
Loss or thinning of body hair, but male pattern baldness halts. Loss of body odor.
Loss of lean muscle mass (hence muscle weakness, increased fatigue, loss of stamina)
Mild breast development, some fat around hips and thighs
The penis will shrink
Hot flushes
POSSIBLE moodiness, tearfulness, depression
There MIGHT be cognitive losses, mostly in spatial orientation and short term memory.
The worst side effect is osteoporosis.