All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
A husband should not imagine that he is having intercourse with his wife as this is just a mere waste of time without any benefit. This could also be a cause of being indulged in illegal sexual intercourse due to the incitement of this imagination. So, we advise you to fast as fasting helps you to become more pious, keep you chaste and diminishes your sexual desire.
Finally, the following matters should be noted:
1) It is the right of the wife that her husband should not be absent from her more than six months except with her permission.
2) A Muslim husband should be residing with his wife as long as possible, as there are many benefits in this, like keeping himself and his wife chaste, nurturing the children and so forth.
Allaah Knows best.