Actually, he had 16000 women. They didn't get married. He married only yet and died without having any kid. But the fact about Krishna was described by Agastya and Katyayani somewhere in Purans. Agastya says, there has been nobody born as much cleaver and lowly as Krisna yet. He just wandered around Gopinis all his life. And Katyayini responds to Agastya "you are right - there has been nobody born yet like Krishna. Yes, Krishna wandered around 16000 Gopinis all his life but he never had any lust for them. He had full control of not only himself but also universe. That's why he was childless even after marrying eight Gopinis." I don't know the truth. Just replaying what I had heard.