What is this giraffe doing?

The one on the right:

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Photos by GTL. Location: Pilanesberg, South Africa

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Depending on where you live/work, the one behind is sexually harrassing the one in front.

My immediate response was "Necking?", but then I noticed those two prongs on his head. Suddenly it was obvious: he's horny...!

In this giraffe herd, the one on the left is the president, and the one on the right is congress.