ImLive
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ImLive is one of the older live cam platforms still actively maintained, and its couple category covers female duo performances alongside mixed pairs. The Group Discount feature is genuinely useful in this context: if enough viewers book the same performer duo for a private show at the same time, the per-minute cost drops for everyone.
Free previews are available and the credit system is transparent. The interface is functional rather than modern, but the performer selection in the couple section is reliable and the site has a loyal user base.