Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
muslim:348b[Chain 1] Muḥammad b. ʿAmr b. ʿAbbād b. Jabalah > Muḥammad b. Abū ʿAdī [Chain 2] Muḥammad b. al-Muthanná > Wahbb. Jarīr > Shuʿbah > Qatādah Bihadhā al-Isnād > Ghayr

This hadith is narrated by Qatida with the same chain of transmitters, but with minor alterations. Here instead of the word - (jahada, (ijtahada) has been used, and the words;" Even if there is no orgasm" have been omitted.  

مسلم:٣٤٨bحَدَّثَنَا مُحَمَّدُ بْنُ عَمْرِو بْنِ عَبَّادِ بْنِ جَبَلَةَ حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي عَدِيٍّ ح وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى حَدَّثَنِي وَهْبُ بْنُ جَرِيرٍ كِلاَهُمَا عَنْ شُعْبَةَ عَنْ قَتَادَةَ بِهَذَا الإِسْنَادِ مِثْلَهُ غَيْرَ

أَنَّ فِي حَدِيثِ شُعْبَةَ ثُمَّ اجْتَهَدَ وَلَمْ يَقُلْ وَإِنْ لَمْ يُنْزِلْ