“And those who guard their chastity (i.e. private parts, from illegal sexual acts). Except for their wives or (the captives and slaves) that their right hands possess, – for them, they are free from blame. But whoever seeks beyond that, then those are the transgressors.” 23.5-7
“And let those who find not the financial means for marriage keep themselves chaste until Allah enriches them of His bounty.” 24.33.