Confused about sex

[spydermrs]

We've just got a new boa, we think its a common but not a 100% sure. We'll post some pics asap.

Its nearly 7ft long and 1ft around.
We were told its a male....but no sign of spurs??????
And he/she hasn't had them taken out.

Our yearling common boa has got spurs which are clearly visible and boy do they hurt if they catch you're skin...lol

Are there any other ways of telling whether its male or female?

Thanks Ruth