many years ago I was dating a girl who wanted us to fly to Portugal to attend a relative's wedding (we live in Canada). I was in my early 20s at the time and never met the person and had zero interest in going or spending the several thousand dollars for flight, hotel, etc. My girlfriend threatened to withhold sex if we didn't go, I said "fine, I'll get it somewhere else". The relationship took a sharp turn downhill and ended soon after.