AE Tessera-Sprintria, time of Tiberius. 

Woman lying left, legs half raised, man kneeling right.
XV within border of dots. 

Campana D30-15; Copenhagen Reutze 2098.
Estimate: 2'000,00 Euros.
With permission of deamoneta.com Auction October 2009, lot 306

Spintriae depicts an erotic scene between two individuals, 
and on the reverse, is a Roman numeral from I to XVI 
within a border and wreath. The numeral is sometimes preceded 
by the letter A. Spintriae on which the reverse is 
signifanctly different are exceptionally rare. Examples 
with a number greater than XVI are probably fakes. 

Simonetta and Riva believed that Tiberius’ supposed prohibition 
of the use of coins with imperial figures in latrines and 
brothels led to the production of of spintriae as payment 
in brothels. However, this is doubtful because these spintria 
also have imperial figures on them! So their use as payment 
in brothels and elsewhere is rejected, and attention is 
redirected to the reverse, with its number, and they are 
considered to have been gambling tokens.