The male genital

Well, since we are supposed to be created in Gods image it must be because also His genitals are darker then the rest of his body. What would God need genitals for anyway? If He is supposed to be the only God, who would he have sex with (when there can't be any female gods)? Ofcourse the male genitals is also for urinating, but why would he need to be able to have an erection?Oh, all the questions this raises..