Before I start I want to make it clear that when I want to block a person I rarely have a problem with him personally, it's rather for the sake of efficiency in terms of looking for guys to meet.
What I meant by that is I chat to many people looking for guys to meet eventually but many don't want to meet (for example they have a partner, they are not ready for hard trampling or whatever other reason) and since my memory is not perfect and the chat history only displays 15 or 20 or so conversations, sometimes I discover that I have chatted to that person before and he already said "no". This is embarrassing and inefficient for me and probably also annoying for the other guy. That's why I'm asking this question. I know that I'm supposed to remember who has declined my suggestion meet but sometimes when I see hot photos especially when there's hot/enticing descriptions underneath I'm tempted to cpmment/chat. :(