Agreed. I had a free ticket to a comedy show, and I wanted to give it away without it going to waste - I had to think very hard and carefully about if I wanted

Agreed. I had a free ticket to a comedy show, and I wanted to give it away without it going to waste - I had to think very hard and carefully about if I wanted to offer it to a female coworker on short notice. The comedian in question did some rather blue jokes, and that could possibly be construed as harassment. It's a shame you can't just offer tickets to coworkers of the opposite sex without worrying about consequences.