Complex sentence: Even if the proclivity to cast a sneaky glance over one's partner's shoulder requires that spontaneous fidelity has to be safeguarded through mutual agreement or legal prescriptions; more often than not sanctioned through penalty--especially when children are at stake.
Split into simpler sentences: Even if the proclivity to cast a sneaky glance over one's partner's shoulder makes that spontaneous fidelity has to be safeguarded through mutual agreement or legal prescriptions. More of than not sanctioned through penalty--especially when children are at stake.