<Dd> In some jurisdictions (such as Indonesia), there are different ages of consent for heterosexual sexual activity that are based on the gender of each person . In countries where there are gender - age differentials, the age of consent may be higher for girls--for example in Papua New Guinea, where the age of consent for heterosexual sex is 16 for girls and 14 for boys, or they may be higher for males, such as in Indonesia, where males must be 19 years old and females must be 16 years old . There are also numerous jurisdictions--such as Kuwait and the Palestinian Territories--in which marriage laws govern the gender - age differential . In these jurisdictions, it is illegal to have sexual intercourse outside of marriage so the de facto age of consent is the marriageable age . In Kuwait, this means that boys must be at least 17 and girls at least 15 years old . </Dd> <Dt> Position of authority / trust </Dt> <Dd> In most jurisdictions where the age of consent is below 18 (such as England and Wales), in cases where a person aged 18 or older is in a position of trust over a person under 18, the age of consent usually rises to 18 or higher . Examples of such positions of trust include relationships between teachers and students . For example, in England and Wales the age of consent is 16, but if the person is a student of the older person it becomes 18 . </Dd> <Dl> <Dt> Circumstances of the relationship </Dt> <Dd> In several jurisdictions, it is illegal to engage in sexual activity with a person under a certain age under certain circumstances regarding the relationship in question, such as if it involves taking advantage of or corrupting the morals of the young person . For example, while the age of consent is 14 in Germany and 16 in Canada, it is illegal in both countries to engage in sexual activity with a person under 18 if the activity exploits the younger person . Another example is in Mexico, where there is a crime called "estupro" defined as sexual activity with a person over the age of consent but under a certain age limit (generally 18) in which consent of the younger person was obtained through seduction and / or deceit . In Pennsylvania, the age of consent is officially 16 but if the older partner is 18 or older, he / she may still be prosecuted for corruption of minors if he / she corrupts or tends to corrupt the morals of the younger person . </Dd> </Dl>

When did 18 become the age of consent