Sextacy , rockin' and rollin and otherwise using MDMA and Viagra at the same time is not advised. Poly drug use often carries with it more risk than use of a single drug, due to an increase in side effects, and drug synergy. If you're interested, there was a study done in 2004 that compares polydrug usage patterns of experience and non-experienced ecstacy users.

http://www.sciencedirect.com/science?_ob=A rticleURL&_udi=B6VC9-4C47CPP-1&_us er=10&_rdoc=1&_fmt=&_orig=sear ch&_sort=d&view=c&_acct=C00005 0221&_version=1&_urlVersion=0& _userid=10&md5=74b7b786e5fc16531ba7161 506534df8#m4.cor*

Beware! You are playing with fire or maybe worse then that. That is all I'm gonna say.