Reason many unmarried females in japan, the majority of Japanese female population ?

Contrary to that, the japanese anime/manga always has love scenes, , ual contact/indications and pairing up of couples. Also, it almost always involves very young girls and guys. They would pair young girls from ages 8 to 15 with guys and suggest intimate encounters and even marriage. I guess in a country like Japan, where people suppress what they really feel and think, it's only natural they their true colours show elsewhere.