Knowledge about sex positions can help deepen your relationship with your partner.

He is my tennis partner.

He increased the time spent together to deepen his relationship with her.

This app provides useful information for everyday life.

His advice was completely useless.

His physique is like that of a sports player.

Sexual intercourse is one of the basic biological behaviors of humans.

They had sex right after they got married.

I'm always amazed by his extensive knowledge.

We have maintained a good relationship for a long time.