Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

All types of sexual pleasure between husband and wife are allowed except intercourse during her menstrual period and penetration in the anus.

Masturbating when wife is away from husband with a picture or without is only permitted if one feared on himself from Haram acts. I do not like the idea of men relieving themselves in such practice always for it affects their intimacy with their wives in the future.

I had many cases of wives complaining about husbands getting used on masturbating for sexual pleasure and not having interest in intercourse itself which is the ultimate pleasure in Halal supposedly!

Almighty Allah knows best.