A. Yusuf Ali:Translation:
Let those who find not the wherewithal for marriage
keep themselves chaste, until Allah gives them
means 2990 out of His grace. And if any of your
slaves ask for a deed in writing (to enable them to
earn their freedom for a certain sum), give them such
a deed 2991 if you know any good in them: even, give
them something yourselves out of the means which
Allah has given to you. But force not your
maids 2992 to prostitution when 2993 they desire
chastity, in order that you may make a gain in the
goods of this life. But if anyone compels them, yet,
after such compulsion, is Allah, Oft-Forgiving, Most
Merciful (to them). 2994

Muhammad Asad:Translation:
And as for those who are unable to marry, 44 let them live in continence until God grants them sufficiency out of His bounty, And if any of those whom you rightfully possess 45 desire [to obtain] a deed of freedom, write it out for them if you are aware of any good in them: 46 and give them [their share of the wealth of God which He has given you. 47 And do not, in order to gain 48 some of the fleeting pleasures of this worldly life, coerce your [slave] maidens into whoredom if they happen to be desirous of marriage; 49 and if anyone should coerce them, then, verily, after they have been compelled [to submit in their helplessness], God will be much-forgiving, a dispenser of grace!
2990 A Muslim marriage requires some sort of a dower for the wife. If the man cannot afford that, he must wait and keep himself chaste. It is no excuse for him to say that he must satisfy his natural cravings within or outside marriage. It must be within marriage.
2991 The law of slavery in the legal sense of the term is now obsolete. While it had any meaning, Islam made the slave's lot as easy as possible. A slave, male or female, could ask for conditional manumission by a written deed fixing the amount required for manumission and allowing the slave meanwhile to earn money by lawful means and perhaps marry and bring up a family. Such a deed was not to be refused if the request was genuine and the slave had character. Not only that, but the master is directed to help with money out of his own resources in order to enable the slave to earn his or her own liberty.
2992 Where slavery was legal, what is now called the "white slave traffic" was carried on by wicked people like 'Abd Allah ibn Ubayy, the Hypocrite leader at Madinah. This is absolutely condemned. While modern nations have abolished ordinary slavery, the "White Slave Traffic" is still a big social problem in individual States. Here it is absolutely condemned. No more despicable trade can be imagined. (R).
2993 I have translated "in" (literally, "if) by "when" because this is not a conditional clause but an explanatory clause, explaining the meaning of "force". "Forcing" a person necessarily means that it is against the wish or inclination of the person forced. Even if they were to give a formal consent, it is not valid because the persons concerned are in (legal, or now) economic slavery.
2994 The poor unfortunate girls, who are victims of such a nefarious trade, will yet find mercy from Allah, whose bounties extend to the lowest of His creatures.