I've done quite some researching with my GF on this these past 6 years.
Please don’t go for the most extreme combo on this list, built it up. Make sure you (and you partner) are experienced. I've put these in an increasingly intense order. (i.e., the bottom one is for the most experienced psychonaut)
Furthermore, most of these drugs lower inhibitions, please make sure you completely trust the person you are engaging with. Set rules and boundaries and code word for stopping.
I tend to mix GHB with all of these (combinations) to add an extra level of horniness. The first 4-5 times GHB didn’t add much for me. It does now (Please make sure you set timers so you don’t overdose)
A N2O can even intensify most of these experiences.
50mg of sildenafil can be added if needed for males, again this adds more risk and strains the heart even more.
Methylone (with GHB) "MDMA light", less psychedelic & less intense, still great for sex and not that bad of a hangover
4-FA (with GHB) More horny then MDMA and Methylone. More straight up "porn sex" you can add methylone for extra feel. Hanger overs are worse though. !Some concern with strokes!
5-MAPB (with GHB) similar to MDMA, little less intense & lovey-dovey.
MDMA (with GHB) When you still have the MDMA magic if feels so good. N2O adds a whole new level of nice)
2C-B (with GHB) little bit more horny than LSD and less bonding.
LSD (with GHB) good for melting with your partner, feels like you become one.
Most tryptamines combined with GHB can be a nice tactile enhancer, similar to LSD and 2C-B, you can add methylone/4fa to increase the 'porn level" and decrease the spiritual/bonding experience. (But this varies greatly from one person to another)
LSD+MDMA (with GHB) more intense then MDMA alone. Again, N2O even intensifies this more
This is the magic one, sometimes the 4-HO-MiPT doesn’t "click" but when it does....:
Do not smoke any weed 24hours prior
100mcg LSD --> t+2:00 4-HO-MiPT + 50-75mg methylone ~t+2:45 --> hit a joint (possible some GHB) This has given me and my GF the most insane orgasms. I've laid afterwards crying in the sheer beauty of it all. A N2O will kinda kick you back into that orgasm. You can also try coming while inhaling a N2O (expert level).
This is INTENSE, can be too intense. Please build up to this.