It doubt it had anything to be with sex or drugs.
Like many bands, there are always ego clashes within any of them. Queen was no exception, and this has been mentioned countless of times by all the guys in the band. One wants an specific kind of sound, and another member wants to do something completely different. They stick to their original ideas so much, that they're hardly willing to try something different.
Just look at the 'One Vision' recording sessions. Brian wanted a certain guitar solo sound, while the other guys wanted something different, yet Brian wasn't willing to give up on the riff he wanted. And remember that this happened after 'Live Aid' when supossedely the band got closer and they weren't so harsh on each other.
I'm sure they really felt like breaking up after the 'Hot Space' recordings and promo tour. The album was quite unsuccessful compared to their previous work, so I'm sure there were a lot of times when they said to each other... "See, I told you so, we should have done something different". Besides, they were probably extremely tired after the end of the tour. So no wonder why they decided to take most of 1983 for a break.
[QUOTE][QUOTENAME]Brandon wrote: [/QUOTENAME]... and now the "best you can offer is Mr. Jingles? HA! He's... just pathetic.[/QUOTE]