1/ is daft, a law that allows the age of consent to be 13, but another law that says if someone is between maybe 13 and 18 then they can't have sex with anyone more than 2 years their senior is more than enough to fight the predatory side. The fact is predators are predators and go for those underage, one of the problems in society is by not talking about it and pretending it doesn't happen and shouldn't happen till older is you leave a whole bunch of kids from age 4-5 to 15 who are taken advantage of but in a society they believe no one should ever talk about sex or in other words, keeping quite and having these laws while we pretend sex is bad below 16 helps predators imo.
2/ absolute nonsense, everyone is different, there is absolutely nothing that suggests a 16yr old is better able to make the decision about when to have sex than a 15 or 12 yr old, just societal piety. I know plenty of people who had sex younger than 16, and plenty who did it older. A couple of those younger wished they'd waited but it really has nothing to do with how old they were and just the person they did it with not being very interested in them after, ie those who thought it was something more serious and 'gave it up' to someone they loved when the other person just wanted to bang and move on to the next person. I would say far more people regret waiting so long precisely because they were led to believe it's a huge deal, it's something you should do with few people and only important relationships and realise that it's more fun and more casual than society likes to pretend and they could have been enjoying it more for longer and waiting and treating it as something special or sacred in later years they realise is basically a moronic position to take.
3/ more cobblers, right, if you don't tell a dude about sex, he won't start getting hard ons, won't hit puberty and won't be attracted to people..... if we don't teach them about puberty it doesn't happen, if we don't teach kids about sexual attraction they won't do anything about it. An urge is an urge, a feeling is a feeling. Lack of education doesn't lead to higher requirements for age of consent, it only leads to higher teen pregnancy and std rates.