After 4-5 weeks of Deca + Anavar (+Winny) I had the same: could not care about sex at all and needed Viagra for erections. The full cycle was 10 weeks. Slowly recovering now (5 weeks after last shot of Deca, just finished PCT). I am done with Deca for good. Next cycle I will go with Primobolan, which I've read is not so bad in this respect.