Lots of ppl have admittedly or not. Its imo a matter only those involved need to handle and work through. Lust and pleasure is human nature from both sexs. But the heart is also fickle. Easy to be hurt. Easy to get jelous. Relationships need 100% honest conversations on the "why or desires" to see if it can be either prevented or worked out. Then you have some who literally are okay with seeing other ppl while still dating. There is no right answer. Its only the individuals involved that needs to communicate. Preferably non violantly otherwise run.