"Well, what if he gave them money for chocolates and candy bc he likes them so much??" We can speculate on any number of reasons he has for these transactions, but more often than not, politicians who try to keep the transactions they send to younger women who have no relation to him a secret usually aren't giving them money for legal reasons.
The committee found credible evidence that he had sex with the 17-year old in June 2017, but because of Florida's statute of limitations on the state's rape laws, the DOJ could not pursue charges. When you consider the evidence and the timeframes presented, it lines up pretty snugly, but sure, he could just be hanging out with a bunch of random underage girls. What do you expect from a politician?