Getting back to your question -
what he said was probably just being defensive - taking the heat of the question under discussion, and trying to make him sound better behaved than he is.
As far as the range of his 'interests', I wouldn;t worry too much. men are seriously curious creatures, especially where sex is concerned - just because he looks at something a little more 'out there' than you would imagine does not mean he either wants to do it with you, or if not, with someone else - it just means he is curious.
Remember, things people are curious about does not always reflect a serious personal interest , or an intnetion to carry out the concept being explored.
If you take that to its locigal conclusion, everyone who visited the London Dungeon would be he;ping the police with their enquiries.