17 dating a 15 year old
15 could be considered Legal under a "Romeo and Juliet" law.
This kind of law can be tacked onto age of consent laws, the principle is simple if the act is consensual and the partners are close-in-age (also called close-in-age exception) You're not entirely correct many jurisdictions has whats called "Romeo and Juliet" laws which protects consensual relationships if the partners are close in age, this can also apply to people who passes age 18 dating someone who is a minor.
Match is strictly for teens aged 18 and 19 (as well as young adults, millennials, and seniors, among others).I would think that it is less common than say a 17 year old boy dating a 15 year old girl.At the same age, boys are less mature than girls, which would be why it is more common for a girl to date an older boy.If anyone finds out, the older person could be charged with rape - not be careful :) It is not illegal to go out regularly with someone, which is what dating is, regardless of the age difference.What is illegal is if one is a minor/below the age of consent and there is intimacy. In most of Europe the age of consent is 16 and below 18 a minor.