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If the ratio of the testicle size to the size of the female (the most thoughtful metric as sexual dimorphism can be the cause of small equipment) is used we are much closer to Orangutans than anything else. (pan and gorilla are at freakish extremes) And as everyone knows they are bigamists (and in some instances rapists) human female fidelity and male promiscuity is the received wisdom. But if I remember right american male cheating is about 30% and female 15% and non- paternity is about 10% (I don't have the study in front of me.) Non-paternity in "mates for life species" tends to be around 30%. So humans are near saints when it comes to things sexual.