I think there is not much else to tell
Just start with 4-6g or ML or GHB (NOT GBL!), then when the euphoria and horny levels of GHB start kicking in, go for 4-MMC to get the orgasmic blast and the maximum horny level
If you want to go TOTALLY WILD in the ultimate session of kinky sex, you can also do 1-2 Puffs of Meth and add a little cocaine or ketamine or any dissos that are well known to have a horny effect or anyway giving a very special effects especially with the "Touch" Feeling. You need to stay low with those tough, or you may have erective issues.. and this will require some viagra, that could be dangerous if you have any hearth disease or such (even a small dosage, 1/4 of viagra, would be enough).
As I said, only the REAL 4-MMC is giving the horny blast and orgasmic body feeling. Don't buy from any clearnet sites 4-mmc, they are all scam or anyway they will send your other cathiones. The only real 4-MMC can be found on DNMs. On Darknet Avenger Forum there was a weekly updated post about the best real mephedrone sellers...sadly site has been seized
But generally, 4-MMC on DNMs from UK is legit and with a purity of 90%+. I've lost the connections with the Off-DNMs chemists / vendors sadly. But having a domestic source, and anyway I got too old for doing such stuff too often.. I'm good, not seeking it in the same compulsive way like before.
And GHB can be found on any DNMs very easily, most sellers are legit. It's cheap and easy to produce, so there is not really many reasons to scam for sellers compared with other drugs. Just check the sellers with the higest reviews and with FE allowed, they are normally legit.
Good Luck.