*note, don't take this as a nasty comment, im just going to say it as i see it, i'd hope everybody would do me the favor of being this honest if i was to take actions such as this
You bought 2 cons and you are 'craving' for attention so you post on here. You want to justify it so you say you rescued them so all is good because your 29 gallon tank is obviously better then the 10 gallon tank with pacus, oscars, JDs, ect, ect.
The first thing i think you need to do is come clean with us. You bought them because you are a major impulse buyer and once you think you want something, you go out and get it. You bought these 2 cons and you are throwing them in your tank with 2 firemouths, a pink con, 1 alive JD if i remember, 1 senegal, 1 ACF, 2 kholi loaches and a common pleco that you say a friend will eventually take, but of course you have no intention of giving it away and you are keeping it until it dies.
Stop lying is the very best thing you could do. If you were honest i wouldn't care if you added 2 oscars into your tank, i wouldn't like it, but i wouldn't feel contempt of you as much as i do for blatantly lying.
If you don't understand what some of those words mean please visit
www.dictionary.com
Now to the actual question you had asked. Yes males can have some orange on their bellies, depending on how much (if its only a couple flecks) i'd be almost betting it is a male with recent spikes of these orange flecked males. If there is a large easily noticible patch of orange, its most deffinately a female.