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Pimples certainly have nothing to do with menstrual disorders; acne is a relatively minor skin condition and is not known to result in any complications. The word "sickness" however can be used to refer to a large number of illnesses ranging from minor colds, coughs, and fevers, to serious diseases like pneumonia, meningitis, or even cancer...

Maintaining an erection should not be a problem for a healthy individual - normally, an erection should last till ejaculation (assuming that this takes a reasonable length of time) or till the stimulation stops. If maintaining an erection is a problem for you, it could be a sign of some health problem...