Another month, another rationality quotes thread. The rules are:
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-- Elizabeth Pisani, The Wisdom of Whores, p. 16
Chronology is evidence of causality, but it's weak evidence. In this case, there are (at least) two problems. First, there could be some other factor (disruption of social network? increase in pro-inflamatory microbiota?) which causes both, but the sex is caused faster. Alternatively, it could be that depression causes low sex drive, but that kicks in immediately whereas it takes months to get a depression diagnosis.
There are good ways to determine causality from observational data, but timing isn't one of them.