"...with a person who lives a normal "active sex life" (at least one new partner a month)..."

The normal? No, well, if paranoia is the norm, then, of course, it is foolish to argue about divorces and responsibility for family, children... one-time relationships, one-time marriages, one-time children, one-time homes, things... and the people themselves with such attitudes - some one-time. To be honest, Gandhi.