Consent is not valid if obtained through force, threats, fear, or lies about what is going to happen. In Canada, the basic age of consent is 14. Anyone who is 14 or over can consent to having most kinds of sex with anyone else who is 14 or over. But there are some exceptions that allow or prohibit sexual activity below and above that age. At any age incest and bestiality are illegal.
Bestiality is sex with animals.
Anal intercourse is only legal in a private place when only two people are present and they are either married to each other or are both at least 18 years old. It is not illegal for a young person to sell sex, but it is only legal to pay someone for sex if they are at least 18 years old. It is also illegal to obtain, or attempt to obtain, sex with a person under 18 in exchange for food, housing, money, drugs, etc. This law applies to babysitters, teachers, life guards, coaches, guardians, social workers, childcare workers, etc., whether or not they are under 18 themselves. People 12 or 13 years old can have sex with anyone without being charged themselves unless they are in a position of trust or authority over their partner.