I agree. A lot of this advice seems geared toward teenagers with raging hormones in my opinion, not mature adults. People often date well into their 30s before getting married these days, and it isn’t realistic to assume adult couples shouldn’t be alone, shouldn’t more than peck kiss, etc. It also assumes that the people live with their parents so that the couples can spend lots of time with each other’s families, which also often isn’t the case. Many young adults live hundreds or thousands of miles away from their families.
My husband and I spent LOTS of time alone when we were dating. We used to sit on the balcony at his house (without chaperones

) and talk for hours. We did not have sex until our wedding night (I was a virgin when we married, he was not when we met). These private, intimate conversations are how we really got to know each other.