Couples nowadays can happily touch and even explore every day, their partner most intimate body parts without one saying to the other don't touch there, don't explore it. Yet, there is no go for a lover to touch his/her lover smartphone for the reason that it's a private intimate thing. Def, there is something wrong going on with this era age we living in this particular regards. That said, to the op, if it's only business you do, then don't fear your lover checking up your phone, that's a proof that she fear to lose you I think, possibly other reasons too, but voila. At the other hand, if you do cheat on her, why not simply end up the relation and go with whoever makes you happy in love instead of actively looking for a way to subtly look her out? A way which I don't think exist other than protecting your private intimate smartphone and not allowing her to unlock it, let alone even start thinking about touching it, My perso 2cent