Sexual activity between husband and wife should continue as long as they are healthy and able. If the wife is young, then her husband must sleep with her at least once every four months.
‘Even if they are aged, they should enjoy themselves as husband and wife in the way which they prefer. Wife is not allowed to refuse to be sexually with her husband as far as she is able. Husband is also required to sexually treat his wife as much as he can.
Wassalam.