Think how weird this would be to someone from the UK a century ago:
"You can have a bisexual orgy on your 16th birthday where someone gets pregnant in celebration of their first time voting, but under no circumstances is the woman allowed to be married until the kid is 15 months old, at which point she can marry another woman. Photographs of the event will, in many jurisdictions, be treated as a criminal offence even though the act itself isn't and those same photos would be fine at 18, which is also now the age when they are no longer subject to a mandatory choice between ongoing education or an apprenticeship."
"You can have a bisexual orgy on your 16th birthday where someone gets pregnant in celebration of their first time voting, but under no circumstances is the woman allowed to be married until the kid is 15 months old, at which point she can marry another woman. Photographs of the event will, in many jurisdictions, be treated as a criminal offence even though the act itself isn't and those same photos would be fine at 18, which is also now the age when they are no longer subject to a mandatory choice between ongoing education or an apprenticeship."
Also, TIL that the UK was going to get compulsory part-time education from 14 to 18 back in 1918, but spending cuts happened: https://en.wikipedia.org/wiki/Education_Act_1918