>>1998042nope.
it's legal to have sex with someone under 18 in several countries, but you're not allowed to do anything other than that.
if you're over 18 and you're fucking someone who's under 18, and you happen to send each other nudes, it's illegal. and if discovered, they'll get charged for distribution of cp, you'll get charged for possession of cp, and also for soliciting a minor. the laws that say sex with someone under 18 is legal are also worded to say that if anything even hints at the minor being persuaded into sex, the adult goes to jail, even if the whole thing was consensual.
the age of consent simply means the country/state defines that age as being acceptable for people to start an active sex life. and in its majority nowadays is to prevent teens from getting into legal trouble for hooking up with each other.
also, age of consent isn't always the same for gays as it is for straights. many countries have age of consent that's under 18 and it specifies that it's for heterosexual intercourse, and then it specifies that homosexual intercourse is not included and the age of consent for it is 18