Thank you for sharing the concern with us. I have few questions for your friend. Once the incident happened , and your friend realised his mistake what corrective measures did he take? What corrective actions were taken by HR? Was he given any warnings, both written and verbal? Was any action taken against him, such as a penalty or detention? Was he offered a counselling and was put on radar after the incident? What was feedback that he received once everything settled down? Did he make amends with the lady? Did she reconcile?
These answers will decide how the HR have treated the incident while recording it in his file, if at all.
Lastly, your friend can initiate a background verification on his own, to understand what his ex-employers are talking about him. In case there is an Amber, he might have to make proper amend with the authorities to ensure their understanding.
Looking forward to hear from you.
7th March 2016 From India, Mumbai