Theres not really anything illegal about the 18 year old dating a 15 year old. However, it gets to be a legal problem if dating means having sexual relations. If you are having sex with this 18 year old guy, then he is committing a felony offense that could make him a sex offender. oral sex is out, too.

Is a 15 year old dating a 18 legal Canada?

For exploitative sexual activity (prostitution or pornography, or where there is a relationship of trust, authority or dependency), the age of consent is 18 years. For example, a 15-year-old can consent to having sexual intercourse with a 20-year-old, but not with a 21-year-old.