I think it would be fine as long as you don't keep that dosing regimen for the rest of your life. Personally, i use monoamine releasers once a season maximum (so that's once per three months). I hope I can enjoy them as long as I want to.
Doing mdma every six weeks is not very conservative but i think it's not considered unhealthy by many people, but I'd suggest living healthily in between doses (sleep, food and exercise). Also i wouldn't keep this up for more than a season (or 2 if you "have to"). If there are that much parties you need to attend high, I'd try something psychedelic instead of empathogenic, way easier on the mind in the long run if you ask me !