This kind of question puzzles me.

Answer is NO.

Of course, there will be those who will talk like "Yes, because labels are too confining and stuff" Well, guess what Sherlock, pseudo-intelectualism can't help here.

1) You suck dick and/or you get sucked (by men): you're not straight.
2) If you don't like labels, then you can do whatever you want and not care. But you asked for a label (straight), and such won't allow any space for dick sucking.

Myself, I don't care much... be happy, walk free, but please, please don't say straight and male blow job in the same context ;P