The distribution of troops devoted to the defence of a place includes a garrison, an occupying force, numerically as weak as possible; a reserve as strong as possible, designed for counterattacking and for providing itself, at the moment it goes into action, with a security service which will guard it from any possible surprise.
The kiss that you have never given is just as powerful as hours of actual lovemaking. The erotic isn't just what is happening between people's legs. It is also what's happening in their erotic mind.