A heterosexual couple implies two partners: an owner of testicles and an owner of vagina. However, both they have anus. Thus, logically a straight couple can use a double-headed toy for vagina-to-anus or anus-to-anus contact.
Since anus is one of the most sensitive area of one's body, be it in a man or woman, both lovers will experience over-the-Moon sensations during their kinky games.
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