The word(s) "sex" appears 64 time(s) in 55 verse(s) in Quran in Mohsin Khan translation.

(41) Then He made his offspring from semen of despised water (male and female sexual discharge).

(42) O wives of the Prophet! Whoever of you commits an open illegal sexual intercourse, the torment for her will be doubled, and that is ever easy for Allah.

(43) Verily, the Muslims (those who submit to Allah in Islam) men and women, the believers men and women (who believe in Islamic Monotheism), the men and the women who are obedient (to Allah), the men and women who are truthful (in their speech and deeds), the men and the women who are patient (in performing all the duties which Allah has ordered and in abstaining from all that Allah has forbidden), the men and the women who are humble (before their Lord - Allah), the men and the women who give Sadaqat (i.e. Zakat, and alms), the men and the women who observe Saum (fast) (the obligatory fasting during the month of Ramadan, and the optional Nawafil fasting), the men and the women who guard their chastity (from illegal sexual acts) and the men and the women who remember Allah much with their hearts and tongues Allah has prepared for them forgiveness and a great reward (i.e. Paradise).

(44) O you who believe! When you marry believing women, and then divorce them before you have sexual intercourse with them, no 'Iddah [divorce prescribed period, see (V.65:4)] have you to count in respect of them. So give them a present, and set them free (i.e. divorce), in a handsome manner.

(45) If the hypocrites, and those in whose hearts is a disease (evil desire for illegal sex), and those who spread false news among the people in Al-Madinah stop not, We shall certainly let you overpower them: then they will not be able to stay in it as your neighbours but a little while.

(46) Does not man see that We have created him from Nutfah (mixed male and female sexual discharge - semen drops). Yet behold he (stands forth) as an open opponent.

(47) It is He, Who has created you (Adam) from dust, then from a Nutfah [mixed semen drops of male and female sexual discharge (i.e. Adam's offspring)] then from a clot (a piece of coagulated blood), then brings you forth as an infant, then (makes you grow) to reach the age of full strength, and afterwards to be old (men and women)- though some among you die before,- and that you reach an appointed term in order that you may understand.

(48) And those who avoid the greater sins, and Al-Fawahish (illegal sexual intercourse), and when they are angry, forgive.

(49) Those who avoid great sins (See the Qur'an, Verses: 6:152,153) and Al-Fawahish (illegal sexual intercourse) except the small faults, - verily, your Lord is of Vast Forgiveness. He knows you well when He created you from the earth (Adam), and when you were fetuses in your mothers' wombs. So ascribe not purity to yourselves. He knows best him who fears Allah and keeps his duty to Him [i.e. those who are Al-Muttaqun (the pious. See V.2:2)].

(50) O Prophet! When believing women come to you to give you the Bai'ah (pledge), that they will not associate anything in worship with Allah, that they will not steal, that they will not commit illegal sexual intercourse, that they will not kill their children, that they will not utter slander, intentionally forging falsehood (i.e. by making illegal children belonging to their husbands), and that they will not disobey you in Ma'ruf (Islamic Monotheism and all that which Islam ordains), then accept their Bai'ah (pledge), and ask Allah to forgive them. Verily, Allah is Oft-Forgiving, Most Merciful.