Hanky-Spanky2: It could just be self replicating nanobots that preform maintenance on internal hardware. The phallus could simply be a transfer an means of transferring between Geth in cases on extreme system failure, OR he could simply be evacuating the redundant previous generation at the end of a replication cycle. Like Salmon.
TransTentacles: Geth were created to serve quarians, I bet some were pleasurebots. And from what I understand, most would still like to serve the creators. Why not have a few extra parts for pleasing them?
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