What are well known instances from Hindu Mythology of marriages between groups of mythical times described as Rakhsasas/Asuras (common guru Shukracharya) versus Devas ?
Have natural change of attitude due to conservatism or sect egos been generally met with social acceptance? Did they face outcasting, disapproval, ostracism etc as time went by? Did a fire of revenge or intense dislike pervade overcoming forgivance that time naturally brings about?
I ask this as they are otherwise often depicted as inherently different genetic/chemical natured belligerent adversaries, one group generally being of piety character and the other as predominantly of evil even though they are said to share an ancient common Kashyapa lineage.
Query is whether marriages were in general less common due to enmity that came from advice of uncompromising elder clan members or due to chromosomal driven attitudes that comes to front in wealth sharing /creation.. that conflict with respected modes of Dharma or its interpretation.. or as YDS points out there have been some singular/notable exceptions (Indra/Sachi, Puloma's daughter) that got accepted by powerful violators ...?