I thought about having a lover and what it would bring as opposed to being single, and honestly being with someone is much better than being alone. Think of all the joy, happiness, and love another person, who is intimate on a different level than from anyone else, could bring to you. Think of the wonderful children you would have all the splendor of watching them grow up, sharing your childhood love and experiences with them, and sharing your live with them. You only live once, and living out your life somewhat alone isn't something most people have in mind. I'm not sure if that's what you mean by if everyone should have a lover, but this is something being in love brings about. I"m sure I missed about thousand other things, but i'm still young and haven't been in love. This is just what i've seen.